Adventure Time Season 6 Episode 25 Astral Plane Episode Title:Astral Plane.Episode Description:While camping with Jake, Finn begins astral projecting, which takes him on a journey across Ooo. After viewing Mr. Fox (voiced by Herpich), Bounce House Princess, Ice King, and Marceline, Finn begins to ponder the nature of life. Catching a ride on a space lard, Finn is carried to Mars, where he witnesses Grob Gob Glob Grod sacrifice himself to save the citizens of Mars from an incoming comet, which is later revealed to be a spacecraft being piloted by Finn's father, Martin.