Along with the seasons' announcement, regulars Justin Roiland, Chris Parnell, Spencer Grammer, and Sarah Chalke were confirmed to return as the Smith family,[1] with other characters including new addition to the cast, Dr. Nimbus.[2] In January 2021, it was revealed that series creator Dan Harmon and Kari Wahlgren, a recurring voice in the series, would return to reprise their roles of Birdperson, Rick's old friend turned enemy after being reprogrammed by Tammy Gueterman and Jessica, Morty's crush throughout the show, respectively.[3]