Not much is known about his early life. He was descended from the people who fled the Nuclear Apocalypse and were brought to Bardo, using the Anomaly Stone and the Temporal Anomaly. During his life, he is a brilliant mind who has always lived by the book, doing exactly what he’s told. He eventually became a Level 11 Disciple.
In Welcome to Bardo, Levitt makes his first appearance in the flashbacks and oversees Octavia's Memory Capture (M-Cap). He befriends her in the process.
In Nakara, as Diyoza, Hope, Octavia, Echo and Gabriel prepare to enter the Anomaly Stone room, Octavia spots Levitt down the hall, now working as a janitor. Levitt silently shakes his head at them and explains to Octavia that there are a dozen Disciples in the Stone room waiting for them who will kill themselves to stop the group from getting back to Sanctum. Levitt instructs the group to head to the surface instead where the Disciples won't follow them as its not survivable for long. Octavia questions Levitt's new profession which he states was worth it and he is still on the code breaking team as they need him too much for that. Levitt states that it was worth it to him and orders Octavia to punch him again and run. After caressing Levitt's face for a moment, she knocks him out and the group follows Levitt's instructions to run though Gabriel hesitates for a moment.
In The Flock, Levitt is assigned to help with the group's training three months before the present. Diyoza confronts Levitt about how the surface is uninhabitable, but Levitt explains that it can be survived for an hour or two and he just needed to buy some time to find another solution. Though Diyoza is dubious of Levitt due to his many jobs, he explains that he was chosen due to his experience with Octavia in the M-Cap and Anders himself will be overseeing their training, something that is extremely rare. Levitt gives them some advice before they are interupted by Anders. Levitt tries to give Anders advice on training the group based on his experiences with them, but Anders brushes him off.
Levitt helps with many aspects of Hope, Diyoza and Octavia's training, running simulations through their minds and running tests with weapons with them. When Echo asks about a biohazard warning, Levitt explains that the room holds Gen-9, the substance that wiped out the native Bardoans, though the Disciples would never dare use it as just a small amount could wipe them all out. After Hope fails the final test, Levitt sorrowfully informs her of this and watches as Echo decides to have her banished to Skyring for five years.
Throughout these events, Levitt continues to grow closer to Octavia leading to the two flirting in her room. The two eventually kiss and have sex with each other.
In A Little Sacrifice, Echo states that she has a plan that she forced Levitt to help her with. After hearing this, a concerned
Octavia rushes to check on Levitt, finding him beaten and bloody. Levitt tearfully states that Echo killed two people in front of him and he broke. Clarke stops Octavia from releasing Levitt, stating that they need to know what Echo is planning. Levitt is stunned to see Clarke, recognizing her as the Key. Levitt reveals the he helped Echo get Gen-9 and she intends to deploy it in the central humidification system on the Machine Level. Levitt admits to telling her how to do it and recognizes Raven Reyes from her understanding of what he means. Levitt begs them to release him so that he can get help to stop Echo, but she sadly gags him again in order to stop Echo without getting her killed. As Octavia leaves, Levitt desperately calls after her.
Levitt is shown to be incredibly intelligent, not only knowing how to operate the M-Cap machine, but how to resist it without the machine damaging the person under its care. Levitt has an understanding of the Temporal Anomaly and how it works, requiring no help to work the Anomaly Stone, commenting that "unlike Dev, I really do know everything."
Despite being a Disciple, Levitt is shown to not be as fanatical as his comrades and to retain compassion for others. He is fascinated by Octavia Blake, seeing her as a warrior, but not a bad person as she believes. When Hope Diyoza arrives to rescue Octavia and her mother, Levitt willingly helps them to escape and even conspires to aid Hope and Octavia in their mission.
Levitt is shown to have picked up some of Octavia's Sky People mannerisms, using the phrase "may we meet again" when parting with Octavia and commenting that Anders can "go float himself" if he wants to interrupt Levitt's M-Cap session with Octavia before they are done.
The relationship between Octavia Blake and Levitt starts out antagonistic towards each other when Octavia is recaptured by Disciple leader Anders and the scientist Levitt. Anders has Levitt use the M-Cap to extract Octavia's memories of her friends, developing a particular interest in Clarke Griffin. Levitt becomes interested in Octavia's history, reassuring her that while she is a warrior, she is not a bad person. After learning that years have passed on Skyring while she's been gone, Octavia offers to give Levitt the information that he wants to know in exchange for him helping her return there for Hope.