AllMovie

Cory (Ben Savage) is hailed as a hero for triggering a fire alarm that saved both Adams High and the school janitor. Noticing that Cory seems a bit too eager to accept all the adulation, Mr. Feeny (William Daniels) suspects that there's something very wrong. And as usual, Feeny is right: Cory and Shawn had accidentally set off the alarm (and the fire!) during a nocturnal foray into the school to turn in their overdue chemistry papers. The trick is to get the "hero" to tell the truth before the Big Lie overwhelms him.