James Crockett

In Red Sun Rising, Niylah wakes him from cryosleep to get his blood for Kane.

Later, trapped in the mess hall, Octavia mentions his mother to him while asking for his help getting the doors open. She says that his mother kept the bunker running long after Jaha died, and that she'd claimed James was an even better engineer than her. The reference rouses James' anger at Octavia, who he blames for his mother's death at the gorge in Shallow Valley. Later, as Octavia taunts them for being "cowards," James gets annoyed and fed up with her. He punches her in the face, causing a fight as Jordan and Niylah beg them to stop. As James tries to kill Octavia to avenge his mother's death, Abby tells James to stand down, invoking Monty's desire to make everyone the good guys. Haunted and devastated, James decides not to kill Octavia.

In What You Take With You, he is seen sitting in the mess hall onboard Eligius IV.

In The Blood of Sanctum, he assists Indra, Gaia, Jackson and Raven in saving Madi from Sheidheda, acting as Raven's assistant in removing the Dark Commander from the Flame. He asks Raven how she learned how to code like she was and she responds "the City of Light community college," leaving James amazed and baffled. However, their attempt to stop Sheidheda is interrupted by Russell Lightbourne. James is later seen walking into Sanctum with Clarke and the others.

In From the Ashes, he runs up to Clarke and Indra to tell them that there was an explosion in the machine room.

In False Gods, James tends to Sanctum's nuclear reactor which is having troubles only to stop for an interlude with his girlfriend Cora. With the problems continuing, James follows her suggestion of retracting the last control rod, but it gets stuck. Confident that he can fix it due to his mentor Jacapo Sinclair being a genius at jury-rigging the Ark's reactor, James apparently fixes the rod only to have radiation suddenly flood the room, killing James and Cora because he left a wrench in the way when moving the rod.

Their bodies are later found by Raven Reyes and Emori when they check on the reactor. Raven, recognizing that its already too late, stops Emori from trying to help them. Raven realizes that they must've pulled the control rod too fast causing a fatal spike of radiation. As a result, the entire reactor is in danger of melting down and killing everyone on Sanctum.

Raven eventually manages to fix the reactor with the help of Emori, John Murphy, Hatch and three other Eligius prisoners at the last possible second. However, the aborted meltdown costs Hatch and the three prisoners their lives with Murphy and Emori only surviving due to their Nightblood.