When Jim is banished into The Deep, he faces a monstrous version of himself. As the two fought, "Evil Jim" at times out maneuvered his counterpart, but the two were evenly matched in combat skills.
Eventually, Jim managed to defeat his dark counterpart, though It is never seen how Jim escaped from his evil self. When Blinky, AAARRRGGHH!!!, Claire, and Toby reunite with Jim within the Heartstone and ask how he survived in The Deep, where no troll has ever come back, Jim remarks that he's "not a troll."
It is presumed that "Evil Jim" was killed by the human Trollhunter.
- "Evil Jim" is seen wearing the Eclipse Armor and, in certain frames, bears fangs and looks somewhat troll-like. This is likely a foreshadowing of Jim's ultimate fate near the end of Part Three.