A Black Night in San Dimas Bill & Ted's Excellent Adventures : Season 1 Episode 7

A math teacher named Ms. Spleen is fed up with Bill and Ted and threatens them with expelling them unless they can catch up with their homework. In order to get a great audience at their concert, they go back to get their old friends Joanna and Elizabeth from 15th century England, but end up in the Crusades with Muslim leader Saladin.