A reluctant dog track owner tries to outrun his problems with the bet of a lifetime.

At 11:30pm on October 11, 1975, a ferocious troupe of young comedians and writers changed television forever. This is the story of what happened behind the scenes in the 90 minutes leading up to the first broadcast of Saturday Night Live.

Dewey Finn, an out-of-work rock singer and guitarist, pretends to be a substitute teacher at a prestigious prep school. After identifying the musical talent in his students, Dewey forms a band of fifth-graders, in an attempt to win the upcoming Battle of the Bands contest.