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'SNL 1975' Adds Willem Dafoe: See Everyone Who's Been Cast

The upcoming film from writer-director Jason Reitman tells the behind-the-scenes story of 'Saturday Night Live's first show ever.

Billy Bryk joins the cast of 'SNL 1975' - Getty Images Chrest -- who most recently appeared in Zelda Williams' directorial debut Lisa Frankenstein-- will play Herb Sargent, credited with the creation of "Weekend Update." Getty ImagesWood, a comedian and theater actor, is set to take on the role of John Belushi, SNL's embattled star who debuted brash characters as well as the iconic "Blues Brothers" sketch during his time on the show. Getty ImagesThe Licorice Pizza star (and son of the late Philip Seymour Hoffman) will play the young NBC executive who helped Michaels develop SNL into the late-night phenomenon it eventually became.

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