Season 6 of “Rick and Morty,” an American adult animated sci-fi sitcom created by Justin Roiland and Dan Harmon for Cartoon Network’s late-night show Adult Swim, will premiere on September 4 on Adult Swim . The series follows in the footsteps of mad scientist Rick Sanchez and his impressionable grandson, Morty Smith, in a fantastical adventure that takes their domestic family life and adventure across dimensions. Roiland voices both, while Chris Parnell, Spencer Grammer and Sarah Chalke voice the rest of the family.