Premise: The History Boys is a 2006 British comedy-drama film adapted by Alan Bennett from his play of the same name, which won the 2005 Olivier Award for Best New Play and the 2006 Tony Award for Best Play. It was directed by Nicholas Hytner, who directed the original production at the Royal National Theatre in London, and features the original cast of the play.
Hypothesis: The cast of the original stage version chose not to participate in the film adaptation.