Rick and Morty are invading Springfield! Characters from Adult Swim's Rick and Morty will show up in the season finale of The Simpsons on May 17th. But its no ordinary couch gag. “This couch gag plays like a full-fledged mini-episode,” said The Simpsons creator and executive producer Matt Groening. “It's going to be a real treat for fans of The Simpsons, fans of Rick and Morty, and fans of animated belching.”