"Walnuts & Rain" is the thirty-first episode of the sixth season of the American animated television series Adventure Time. The episode was written and storyboarded by Tom Herpich, from an outline by Herpich, Adam Muto, Kent Osborne, Jack Pendarvis, and Pendleton Ward. The episode debuted on March 5, 2015 on Cartoon Network, and guest stars Chris Isaak as a bear named Seven and Matt L. Jones as King Huge.