Adventure Time Season 8 Episode 15 - Do No Harm Episode Title:Do No Harm.Episode Description:Finn heads to the Candy Kingdom hospital to check on Susan and ends up filling in for Doctor Princess. While things seem to be fine at first, it becomes apparent that Finn's doctor skills are amateur at best. Meanwhile, Jake and Grass Finn go searching for the Grass Wizard in hopes that he will discover meaning to his life. When it's revealed that Grass Wizard simply made him for fun, Grass Finn beats him up which lands him in the hospital. Grass Finn changes his name to Fern and leaves to travel Ooo and Susan finally awakens from her coma.