"Astral Plane" is the twenty-fifth episode of sixth season of the American animated television series Adventure Time. It was written by Jesse Moynihan and Canadian artist Jillian Tamaki. In the episode, after a comet causes Finn to project astrally, he follows the exploits of several characters, eventually floating up to Mars, where the same comet is about to collide with the planet. The episode is the first that Tamaki wrote for the show. As a storyboard artist, she praised the unique production of the show, though she described animation as more limited than comics. The episode premiered on Cartoon Network on January 22, 2015.