Dylan O'Brien and Lamorne Morris are set to play two original 'Saturday Night Live' cast members in Jason Reitman's feature 'SNL 1975.' O'Brien has landed the role of Dan Aykroyd, while Morris is set to portray Garrett Morris. The movie is based on the screenwriters' interviews with the show's living cast, scribes and crew. It is set to focus on the formative moment in October 1975 when the NBC sketch show debuted.