This is the 5th season of Adventure time this season premiered March 2013
Tanner Kufleitner take over as a Director of season 5
Episode 1: The New Hero
Plot: Me-Mow tries to kill finn and jake instead of wild berry princess but they trap her in a jar unti she told them i wanna kill her because the guild of assassins was my Job i need a Job for my money then finn and jake hired her as a new hero but finn still dislike her and she's trainning unti she fights the ice king at the End.
Note: this episode is a sequel to the season 3 episode Jake Vs Me-Mow.