J.K. Simmons has rounded out the cast for Jason Reitman’s delve into behind-the-scenes happenings of the opening night of ‘SNL’ in ‘SNL 1975’.

Billy Bryk (Friendship), Joe Chrest (Stranger Things), Taylor Gray (Star Wars: Rebels) and Mcabe Gregg (Teenage Badass) have also joined the cast.

Simmons is set to take on the role of comedian Milton Berle, with Chrest as Weekend Update co-creator Herb Sargent. Gray and Gregg portray Al Franken and Tom Davis, the SNL writer-performers of duo Franken & Davis. Details as to Bryk’s role haven’t been disclosed.

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The latest group of actors join the already cast Gabriel LaBelle who leads the ensemble as Lorne Michaels, with Cooper Hoffman, Rachel Sennott, Ella Hunt, Lamorne Morris, Dylan O’Brien, Nicholas Braun, Finn Wolfhard and Kaia Gerber.

The script for the project is penned by Reitman and Gil Kenan. The pair conducted several interviews with all the living cast, writers, and crew members of SNL. The project is being produced by the duo along with Jason Blumenfeld and Peter Rice, while Erica Mills and Joann Perritano are the executive producers.