Abraham Lincoln debuts in the animated short, where he encourages Finn to believe in himself after warping his brain into the past and onto Mars. He is also seen in the episodes "Return to the Nightosphere" and "Business Time." In "Business Time," he is a character included in a game on BMO. In "Return to the Nightosphere," he was a cameo in a picture with Hunson Abadeer. As revealed in the episode "Sons of Mars," he was the King of Mars. He attempted to execute Magic Man (which was actually Jake) and accidently killed him. He then gave up his immortality to save Jake, which he then turned into a statue. He is also mentioned in "Crystals Have Power," where Jake says, "If I had a penny for everytime someone hopped up on magical energy, I'd be Abraham Lincoln!"
He is one of the most detailed characters in Adventure Time. He has 5 fingers, and his skin is the same color as Finn's. His hair is black, and he wears dress shoes, along with a suit. He has a mole on his face, and a beard.
- When he died in Sons of Mars, his statue resembles the real-life statue of him.