Martin Mertens



Martin is a new character from the Season 6 premire episode of Adventure Time entitled "Escape from the Citadel."

Escape from the Citadel
Martin was Finn's biological father who was locked up in the Citadel for unknown reasons. He was first mentioned towards the end of the Season 5 finale entitled "Billy's Bucket List" in which the late hero, Billy, informs Finn of him being alive and imprisoned in the Citadel. Season 6 opens with Finn and Jake entering the Citadel to find Martin. They also unwittingly brought The Lich with them.

When they finally found Martin, it turns out that Martin wasn't all as cracked up as Finn built him up to be. He was actually a jerk who could care less about his son; in fact, he doesn't even remember him nor does he even remember why he abandoned him in the woods those many years ago. All he cared about was escaping the Citadel.

At the climax of the episode, the Lich is defeated with the Guardian's blood getting sprayed on him, and Martin attempts to escape the collapsing Citadel in an escape pod. Finn grabs onto the escape pod using his Grass Sword, and it transforms on his arm. Unfortunately for Finn, this mutation causes his arm to get severed from its socket, and he finally loses his right arm. Jake and Shelby then go to Finn to comfort him about losing his arm and his father.

Trivia

 * He's played by Stephen Root.