A Case of Stageblight

S1 E21: Dale is disappointed when he drags the other Rangers to a theater for a movie, and it turns out to be an opera house. But things get exciting when they witness the attempted murder of the opera's star, Clarence Dudley. They follow two mysterious figures into the sewers beneath the Opera House, who turn out to be the hand puppets of a crazy alligator, Sewernose De Bergerac, who was flushed as a baby. Sewernose captures the Rangers to use as marionettes in his private puppet "dinner show" (the Rangers being both dinner and the show). Sewernose returns to the opera house and manages to replace Dudley on stage.