Jacapo Sinclair

“	We saw the missile, heard the blast, figured you could use some help.	”
— Sinclair leading Sky People to help the Grounders in Tondc ^[src]

Jacopo Sinclair was a recurring character in the first, second, third and fourth seasons. He was portrayed by Alessandro Juliani and debuted in the series premiere.

Sinclair was the Chief Engineer and a former inhabitant of the Ark. On the ground, he continued his duties and supervised the construction of Camp Jaha. In "Demons," he was killed by Carl Emerson while protecting Raven Reyes. In "The Other Side," he returns as a hallucination to help Raven solve her deteriorating condition.

Early Life[]

Sinclair was born on the Ark and trained to be an engineer. He would later become Chief Engineer and mentor of Monty Green, Raven Reyes and James Crockett in Engineering. At some point during his time on the Ark he married, though his wife's name is never revealed.

Throughout the Series[]

In Pilot, when Marcus Kane enters the Ark's Earth Monitoring Station, Sinclair tells him that the Delinquents' dropship has suffered total system failure and were off-course as of their last telemetry. Sinclair warns that the only communications left is the telemetry from the Delinquents' wristbands and everything that they had programed into the dropship to help them is gone. Sinclair later attends the briefing where Kane and Abby Griffin argue about the status of the Delinquents' on the ground.

When Abby is nearly floated, she orders Eric Jackson to talk to Sinclair about potentially using the Delinquents' wristbands to contact them.

In Earth Skills, Jackson mentions that Sinclair said that the wristbands aren't meant to receive signals so even if the Ark could send one, the Delinquents couldn't receive it through the wristbands.

In Twilight's Last Gleaming, Sinclair reports that all vents and hatchways to Section 17 have been closed and they have a hard seal. Sinclair asks for the order for him to vent the air and begin the Culling, but Jaha steps forward and does it himself, taking on the burden of killing 320 people rather than making Sinclair do it. Along with everyone else, Sinclair watches as the people in Section 17 are suffocated to buy the Ark more time to fix the life support systems.

In Contents Under Pressure, Sinclair responds to a hail on the Ark-wide channel, stating that it is a restricted channel and demanding to know who it is. Raven identifies herself and states that she is calling from Earth and the 100 are still alive. Sinclair orders Raven to hold on while they boost her signal and issues orders to get Raven off of the Ark-wide channel. Abby Griffin, Marcus Kane and the Thelonious Jaha enter and Sinclair confirms that they have traced the transmission as coming from the ground.

Sinclair listens with surprise as Clarke reveals that the Earth is survivable and that there are survivors on the ground. With Finn Collins needing Abby's help, she orders Sinclair to patch the transmission through to Medical. Before he can, Jaha asks about his son and Clarke reveals that Wells is dead, noticeably saddening Sinclair at the news. Leaving, Jaha orders Sinclair to patch the Delinquents through to him when Abby is finished. However, the transmission breaks up and Sinclair draws Abby's attention to a hurricane right on top the Delinquents' location.

In Unity Day, Sinclair is seen informing Jaha that a few stations on The Ark have lost all power. He then informs him that if Diana Sydney manages to take off in the Exodus ship then she will cut off almost all power on The Ark, killing most of the Citizens. Later he is seen aiding Jaha, Kane, and a few other guards try to keep the doors to the Exodus Ship open to prevent its launch. They are able to keep the doors open but, it is forced closed when a man jumps on the Exodus Ship after he learns from Diana Sydney that there are not enough drop ships for all the Citizens on the Ark. Sinclair and the others stand back, the Exodus Ship takes off and all power on the Ark is lost.

In The Calm, Sinclair is mentioned by Kyle Wick, who said Sinclair instructed him to hold open a door. Sinclair can be seen in Earth Monitoring Station alongside Jaha and a few others after The Ark suffered catastrophic failure. Sinclair and the others are running out of oxygen, and decide that before they die they will supply as much power to as many stations as possible. However, Kane and a few others come in and rescue them, giving them oxygen masks. When Sinclair and the others are brought to their feet, Sinclair and Wick explain how there might be some survivors who might have been thrown off of the ship by Diana Sydney, as they state there are apparently some stations close to the Exodus Ship launch area which are still intact.

In We Are Grounders (Part 1), Sinclair can be seen in Earth Monitoring station working with Kane to figure out a solution to save The Ark. However, Sinclair sees there is no hope and requests to go home to his wife. Jaha then walks into the room and asks Sinclair if they use The Ark's thrusters to get to the ground, how much will be destroyed, which Sinclair tells him 95%. Sinclair is then instructed to locate the 5% that will survive and everyone will be stationed there in order to make it to the ground. Sinclair opens the blueprints given to him by Jaha and gets straight to work.

In We Are Grounders (Part 2), Sinclair explains the to the inhabitants of the Ark the workings and possible consequences of using the Ark to return Earth, explaining that some parts of the Ark will be destroyed when entering the atmosphere along with the people inside. After everyone is strapped in for the descent, Sinclair tries to remotely separate the Ark's stations from the Earth Monitoring Station with explosives so they can use the Ark's thrusters to blast them towards Earth, but the remote detonation fails and Sinclair informs Jaha that someone will have to manually detonate the bombs, therefore, someone must stay behind. Kane volunteers and is ready to leave. Sinclair tells Abby that he will have one week of air left two at the most. The Ark suddenly shakes as the bombs explode as Jaha has gone to the Earth Monitoring Station to manually detonate the bombs. The Earth Monitoring station separates from the other stations, which start heading for Earth as the thrusters activate. Sinclair survived the crash landing with Abby and Kane and is now on Earth with them.

In The 48, Sinclair first appears along with Abby and the rest of the survivors of Mecha Station's crash after Kane shoots and kills Tristan. Kane then has a short discussion with Bellamy and Finn, before ordering Sinclair to take Sterling, Monroe, and the majority of the surviving adults back to Alpha Station. Later, when Kane returns to the crashed station, he discovers that Sinclair has named their new home "Camp Jaha". Sinclair then says that there has been no word from Jaha and calls Kane the new Chancellor.

In Many Happy Returns, Sinclair checks the fence that surrounds Camp Jaha and confirms that it is now active. He warns everyone to stay away from it and goes to find Raven Reyes. He instructs her to get working on a radio beacon so that they can make contact with any other Ark stations who made it to Earth.

Many Happy Returns 013 (Sinclair) — Sinclair electrifies the fence surrounding Camp Jaha

Later, after Raven and Wick have set up a signal balloon, Sinclair compliments them on the idea. However, Major Byrne appears and shoots the balloon down and tells them that Grounders can use it to pinpoint their exact location and says that she expected better to him.

In Human Trials, Sinclair is present at a discussion about Mount Weather. He says that he doesn't wish to seem uncaring, but that the 47 Delinquents appear to be in no immediate danger and that they have plenty of time to come up with a plan to free them.

He also is then seen chatting with Byrne when Abby orders her to not let anyone leave the camp.

In Spacewalker, he is seen in flashbacks telling Raven that she got her Zero G certification and congratulates her. Raven tells him that she failed the physical but he tells her that he saw her test scores and overruled the rejection.

In Rubicon, Abby mentions that Sinclair gave her a letter from Jaha saying that he left with twelve others for The City of Light.

In Resurrection, Sinclair arrives at Tondc with Jackson and a group of Arkers. He explains that they saw the missile blast from Camp Jaha and that they've come to help out the Grounders affected.

In Ye Who Enter Here, Bellamy, Raven, Gina, and Octavia arrive at Mount Weather and enter the dining room. Sinclair arrives and tells Raven to get working on the electrical problems. Later, as the lights are flickering on and off, Raven and Gina make their way with Sinclair to the mess hall, having been called there in an emergency. In the mess hall, as Charles Pike and Bellamy question Echo, other Farm Station members are grabbing weapons and arming themselves. Sinclair and Pike get into an argument about using the missiles in Mount Weather, since Sinclair doesn’t agree with him and they still don’t have the launch codes, Raven says she might be able to help get the launch codes, and Sinclair is visibly confused by her actitude. Sinclair, Raven, and Gina begin digging through the computer files in the Mount Weather Command Center as they look for the codes to the missiles. Gina suggests that Dante might have written down the passcodes and leaves to check the President's office for the codes.

Both Raven and Sinclair still have not found the launch codes. Raven gets frustrated and gives up because it is already dark and they are too late. Sinclair tells her she is someone who does not give up. He says that if she knows of a way to fix something, she fixes it and the reason she won't fix herself is because she feels she deserves it. Raven asks if she is just broken. Sinclair reminds her that he took a chance on her even with her heart defect and she should take a chance on herself, too. Gina radios in that she has not found anything in the president's office as the Ice Nation assassin arrives behind her and stabs her, mortally wounding her. Raven keeps trying to reach Gina as the assassin clears off the president's desk and triggers a monitor to access the program for Mount Weather's self-destruct feature. Gina reaches the radio and tells Raven about the self-destruct and the assassin. Raven and Sinclair chase after the assassin as he runs out the side-door of the Mountain. Sinclair gets tackled by the assassin and they fight, with the assassin getting the upper hand. Raven arrives in time and shoots the assassin dead. Sinclair gets the numbers as Raven tries to reach Gina but Gina is not responding. She starts to head back into the Mountain as Sinclair tries to stop her. Gina is dead, the countdown reaching zero reflects off Gina's eye and Mount Weather explodes, throwing Raven and Sinclair back and killing all of the Farm Station survivors who were inside.

In Terms and Conditions, he was in the bar area helping with the rationing of supplies on Charles Pike's orders when Jasper approaches him for a glass of alcohol and Sinclair rejects him saying that they’re rationing supplies since the grounders poisoned the lake they live next to, Jasper storms off.

He later helps Marcus Kane by trying to tamper with Rover One to stop Pike and his followers, but he is caught by Bellamy and is charged with treason. In the interrogatory room, he refuses to talk and instead of executing him, Pike locks him up with the other grounders and Lincoln. Once he gets there, he reveals it was all a plan and tells Lincoln to get ready because tonight’s “a go”.

Later, Sinclair says that he’s ready to talk and Bellamy goes to talk with him for information of Kane and the others, Sinclair is going to talk when Lincoln swings at him and starts beating him up, Bellamy opens the door but that was part of the plan too and all the grounders cause a riot as a distraction for Kane to take Pike in the Rover. However, the plan fails since Monty warns Bellamy of it and he reaches Kane in time, Pike sentences him to death.

In Stealing Fire, Sinclair, Kane, and Lincoln are sentenced to death for treason. However, he and Kane are able to escape.

In Fallen, he arrives at the cave with Octavia, Kane, Bryan, Harper, and Nathan. He sees how Octavia beats up Bellamy and is disgusted by it. He then stays at the cave when Kane, Octavia and Bellamy leave to the dropship.

In Nevermore, Sinclair aids Clarke, Bellamy, Octavia, Monty and Jasper in trying to free Raven from A.L.I.E. by completing Raven's work on an EMP. While he works, Sinclair expresses worry that in using the EMP, he might fry the brain of the brightest girl he knows, but completes the work anyway even when Raven warns that the EMP could cause her brain damage. After hooking up the rover's battery, Sinclair is able to fry the chip in Raven's head, freeing Raven of A.L.I.E.'s control. However, Raven remains unresponsive until Clarke cuts into the back of her neck and the liquified remains of the chip leak out. Sinclair is relieved when Raven awakens, herself again.

In Demons, after arriving back at Arkadia, he is stabbed and dies by Carl Emerson while protecting Raven after the Mountain Man infiltrated Arkadia.

In Red Sky at Morning, when Jaha suggests that Sinclair is the one hacking into the City of Light, A.L.I.E. reveals a knowledge of his death and that his first name is Jacapo.

n The Other Side, as Raven experiences a seizure from her deteriorating condition, a hallucination of Sinclair approaches her and takes Raven's hand as she passes out. When Raven regains consciousness, she finds her hallucination of Becca Franko tied up and Sinclair waiting who chides Raven, stating that he didn't die so that she could kill herself. Raven believes that she's dying and that there's no hope, but Sinclair encourages her to try to find a solution first and suggests that they take a look at her brain and Raven agrees.

Looking at a scan of Raven's brain, Raven explains that the EMP used to free her from A.L.I.E.'s control was like shutting a computer down by pulling the plug. As a result, it left residual code inside of her brain that is causing both her increased intelligence and her deteriorating condition. Sinclair suggests purging the residual code to stop further damage and to give Raven's brain time to repair itself. Sinclair questions how she would purge the residual code in a regular computer and Raven states that she would just have to reboot it. Raven and Sinclair realize what they need to do, but are interrupted by Becca who argues with Sinclair about the plan: stopping Raven's heart long enough for all electrical activity in her brain to cease, effectively rebooting Raven's mind when she is revived. Becca argues for Raven to go to the stars to die while Sinclair argues for Raven to try her plan, freezing herself to the point that her heart stops while preserving her brain, so that she can live. Though Becca extols the virtues of Raven's increased abilities, Sinclair states that he prefers Raven herself over any genius her new intelligence could be compared to and Raven decides to go with her and Sinclair's plan to save her life.

Raven sets herself up in a tank of icy water and Sinclair goes over Raven's plan to restart her heart once enough time has passed and is impressed by her simple, yet effective solution to the problem. Though Becca argues that the plan is a waste of Raven's talent, she ignores her. Sinclair warns Raven that with her heart murmur, Raven may go into cardiac arrest and have to shock herself again with the defibrillator once she is revived to solve the problem. Though Sinclair expresses concerns about her life instinct preventing the plan from going through, Raven assures him that she is ready to die to really live. Sinclair tells Raven that if she succeeds, they will both be gone once she wakes up, but Raven states that Sinclair is always with her and thanks him. Sinclair tells Raven that she did it herself, not Sinclair and not Becca and that it had been in Raven all along. As Raven submerges herself and flatlines, Sinclair holds his hand up to hers on the tank. Once Raven's heart stops, Sinclair and Becca walk away.

After Raven is revived, both Sinclair and Becca are gone for good, the plan to purge the remnants of A.L.I.E.'s code having succeeded.

In Nevermind, Clarke experiences a flashback of Sinclair freeing Raven from A.L.I.E.'s control using an EMP after the hallucination of the AI in her mind reminds her that the same technique can be used to destroy Clarke's neural mesh if Josephine Lightbourne gets her hands on the memory.

In False Gods, while trying to fix Sanctum's nuclear reactor, James Crockett states that Sinclair was his mentor and a genius at jury-rigging the Ark's reactor. As a result, James thinks he can fix Sanctum's reactor in his sleep. However, he accidentally causes the reactor to begin to meltdown instead, killing him in the process.

Personality[]

Sinclair acts mostly neutral and is loyal and formal towards his superiors. He is shown to hold his superiors in high regard, initially wanting to name the Alpha Station settlement after Jaha. Unlike many characters, Sinclair has shown little to no personal feelings/views in regard to peace or war with the Grounders. However, he did not hesitate to come to their aid following the missile strike in Tondc, and took Kane’s pro-peace side in the Arkadian Civil War. He is shown to put his morals before the law if need be, seen when he encourages Raven and Wick to put the radio on a hot air balloon, despite Major Byrne’s protests, and when he goes against Pike to help his people and the imprisoned Grounders. He often takes on the role of a mentor, seen as he has mentored Raven, Monty Green, and James Crockett in engineering. He also has a deep desire to protect the Delinquents, especially Raven, seeing as he “adopted” her as a daughter-figure, worked to bring her back after she took the chip, and sacrificed himself to save her life when Emerson attacked them.

Physical Appearance[]

Sinclair was of average height and has frizzy black and gray hair. He also has brown eyes.

Relationships[]

Marcus Kane[]

Sinclair and Marcus have a professional relationship built on mutual respect.

Thelonious Jaha[]

Sinclair and Jaha share a professional relationship. Sinclair listens to Jaha and goes by all of his orders without question.

Abigail Griffin[]

Sinclair and Abigail share a professional relationship. They work together in the Monitoring Station. Sinclair watches the screen which shows the status of the Delinquents. He helps Abigail figure out why the delinquents' wristband signals stop transmitting.

Raven Reyes[]

Main article: Raven and Sinclair

Sinclair and Raven used to work together on the Ark. Despite being co-workers, they share a strong bond and have a father-daughter relationship. While preparing the EMP to free Raven from A.L.I.E., Sinclair expressed worry about potentially harming the smartest girl he knows. They both care a lot about each other. Raven is seen deeply affected by Sinclair's death. Notably, when Raven was dying, it was Sinclair her mind summoned to help save her, who convinced her to fight and helped Raven come up with a solution. When her Sinclair hallucination states that he will be gone if the plan works, Raven says that he is always with her.

Appearances[]

Season One
Episode	Appearance Status
Pilot	Appears
Earth Skills	Mentioned
Earth Kills	Absent
Murphy's Law	Absent
Twilight's Last Gleaming	Appears
His Sister's Keeper	Absent
Contents Under Pressure	Appears
Day Trip	Absent
Unity Day	Appears
I Am Become Death	Absent
The Calm	Appears
We Are Grounders (Part 1)	Appears
We Are Grounders (Part 2)	Appears

Season Two
Episode	Appearance Status
The 48	Appears
Inclement Weather	Absent
Reapercussions	Absent
Many Happy Returns	Appears
Human Trials	Appears
Fog of War	Absent
Long Into an Abyss	Absent
Spacewalker	Flashback
Remember Me	Absent
Survival of the Fittest	Appears
Coup de Grâce	Mentioned
Rubicon	Mentioned
Resurrection	Appears
Bodyguard of Lies	Absent
Blood Must Have Blood (Part 1)	Absent
Blood Must Have Blood (Part 2)	Absent

Season Three
Episode	Appearance Status
Wanheda (Part 1)	Absent
Wanheda (Part 2)	Absent
Ye Who Enter Here	Appears
Watch the Thrones	Absent
Hakeldama	Absent
Bitter Harvest	Mentioned
Thirteen	Absent
Terms and Conditions	Appears
Stealing Fire	Appears
Fallen	Appears
Nevermore	Appears
Demons	Appears
Join or Die	Absent
Red Sky at Morning	Mentioned
Perverse Instantiation (Part 1)	Absent
Perverse Instantiation (Part 2)	Absent

Season Four
Episode	Appearance Status
Echoes	Absent
Heavy Lies the Crown	Mentioned
The Four Horsemen	Absent
A Lie Guarded	Absent
The Tinder Box	Absent
We Will Rise	Absent
Gimme Shelter	Absent
God Complex	Absent
DNR	Absent
Die All, Die Merrily	Absent
The Other Side	Appears
The Chosen	Absent
Praimfaya	Absent

Season Six
Episode	Appearance Status
Sanctum	Absent
Red Sun Rising	Absent
The Children of Gabriel	Absent
The Face Behind the Glass	Absent
The Gospel of Josephine	Absent
Memento Mori	Absent
Nevermind	Flashback
The Old Man and the Anomaly	Absent
What You Take With You	Absent
Matryoshka	Absent
Ashes to Ashes	Absent
Adjustment Protocol	Absent
The Blood of Sanctum	Absent

Season Seven
Episode	Appearance Status
From the Ashes	Absent
The Garden	Absent
False Gods	Mentioned
Hesperides	Absent
Welcome to Bardo	Absent
Nakara	Absent
The Queen's Gambit	Absent
Anaconda	Absent
The Flock	Absent
A Little Sacrifice	Absent
Etherea	Absent
The Stranger	Absent
Blood Giant	Absent
A Sort of Homecoming	Absent
The Dying of the Light	Absent
The Last War	Absent

Quotes[]

Raven Reyes (fragmented transmission): "Calling Ark station. Come -- to -- Ark station."

Abby Griffin: "Raven. She's still alive."

Raven Reyes: "Are you there? Please come in. I repeat, calling Ark station. The 100 are alive. Can anyone hear me?"

Jacapo Sinclair: "This is a restricted channel. Who is this? Please identify yourself."

Raven Reyes: "This is Raven Reyes. I'm from Mecha Station. I'm transmitting from the ground. The 100 are alive. Please, you need to get Dr. Abby Griffin. Dr. Abby Griffin, now."

Jacapo Sinclair: "Hang on, Raven. We're trying to boost your signal. Get her off the Ark-wide channel, this room only. Copy?"

Abby Griffin: "Can she hear me?"

Thelonious Jaha: "Did you confirm the signal's origin?"

Jacapo Sinclair: "Yes, sir. It's coming from Earth."

— in Contents Under Pressure

Marcus Kane: "What if we jettison sections 3 through 7?"

Sinclair: Sir, we've run every scenario twice. There are no more options. I would really like to be with my wife."

— in We Are Grounders (Part 1)

Sinclair: "Ladies and gentlemen the fence is hot. Trust me you do not want to go near it".

— in Many Happy Returns

Sinclair: "We saw the missile, heard the blast, figured you could use some help."

— Arriving in Tondc to help the victims of the bombing in Resurrection

Jacapo Sinclair: "Reyes!"

Raven Reyes: "Yes, sir?"

Jacapo Sinclair: "How's that supply line coming?"

Raven Reyes: "It's a piece of crap, Sir. But I'll get it working."

Jacapo Sinclair: "No you won't. I'm pulling you off duty. You got your Zero-G certification. Congratulations."

Raven Reyes: "But I failed the physical.

Jacapo Sinclair: "Yeah, I saw your test scores. I overruled the rejection, you're in. Now get moving."

— in Spacewalker

Raven Reyes: "What's wrong?"

Jacapo Sinclair: "What's wrong? I didn't die so you could kill yourself."

Raven Reyes: "I'm not killing myself. I'm -- I'm dying. There's a difference."

Jacapo Sinclair: "The Raven Reyes I know doesn't quit. She keeps fighting."

Raven Reyes: "What's happening to my brain isn't something you can fight."

Jacapo Sinclair: "How do you know? Have you tried? Before you junk this beautiful mind on a whim, let's say we look under the hood first? Kick the tires. I'm guessing there's still a few good miles in there."

Raven Reyes: "Ok."

— in The Other Side

Raven Reyes: "Using an electromagnetic pulse to get A.L.I.E. out of my head was like shutting down a computer by pulling the plug."

Jacapo Sinclair: "Part of the code is still in your head."

Raven Reyes: "Exactly, which is why I'm Super Raven. And about to be super dead."

Jacapo Sinclair: "Unless we can purge the code, stop the damage from getting worse, give your brain time to repair itself. How would you do it to a computer?"

Raven Reyes: "Purge the residual code? Simple. Just reboot it."

Becca Franco: "The human brain is not a computer."

Jacapo Sinclair: "No kidding. That's why your code is killing her. Now listen to me. You'd have to stop your heart long enough for all electrical activity in your brain to stop, too."

Becca Franco: "15 minutes. She'll be brain dead long before she can get her heart started again."

Raven Reyes: "Not if I was frozen. Well, not frozen. But just really damn cold."

Becca Franco: "Raven, the suit is ready. It's T-minus now and counting. Let's go for a walk in the stars."

Jacapo Sinclair: "She's not going to space to die. She's going in the bunker to live."

Becca Franco: "Even if this idea doesn't kill you, you will just be normal again."

Jacapo Sinclair: "She was never normal."

Becca Franco: "Maybe not, but with me in her brain, she's Da Vinci, Einstein, Mozart."

Jacapo Sinclair: "And I choose Raven Reyes over those 3 hacks any day and twice on Sunday."

Becca Franco: "Enough. Raven, what makes you think that the future will be any different than the past? Even if you live, the pain will still be with you."

Raven Reyes: "I don't choose pain. I choose life. Let's get to work."

— in The Other Side

Jacapo Sinclair: "If this works, you'll wake up, and we'll both be gone."

Raven Reyes: "You're always with me."

— in The Other Side

Notes and Trivia[]

In "We Are Grounders (Part 1)," it was revealed that Sinclair has a wife. It is unknown if she is still alive or not. In "Nevermore," he says that Raven is all that he has left, implying that his wife is gone.
He studied Latin.
- He was the one who figured out that A.L.I.E. 2.0's activation phrase is "ascende superius". He worked this out by translating the phrase "seek higher things" from Becca's notebook into Latin.
In "Red Sky at Morning," it was revealed that his first name was "Jacapo" by Jaha and A.L.I.E. when she mentions his death. This also gave away that someone in Arkadia had taken the chip.
Lindsey Morgan speculates that Sinclair is Raven's dad.^[1]
He was Monty Green's and James Crockett's mentor.
Sinclair appears in "The Other Side" as a hallucination to Raven, and he persuades her to "choose life" instead of going into space to die.
- He is the fifth character to appear after their death as a hallucination, along with Wells Jaha, Finn Collins, Jake Griffin and Becca Franko, incidentally sharing scenes with the latter.
He is one of the few recurring and major characters with no known kills either directly or indirectly.
- In "Twilight's Last Gleaming," he nearly kills the 320 people involved in the Culling, but Jaha decides to push the button himself instead of making Sinclair do it.
While Raven is the first one to make radio contact with the Ark from the ground in "Contents Under Pressure," Sinclair is the first one to make radio contact with the ground from the Ark when he responds to Raven's hails. While it is impossible to tell who it is by voice, the subtitles identify the person as Sinclair.