Alicia Silverstone made her debut in which film?

Alicia Silverstone made her film debut in The Crush.

Released in 1993, The Crush is a psychological thriller written and directed by Alan Shapiro. Silverstone plays Adrian Forrester, a teenager who becomes dangerously obsessed with Nick Eliot, a journalist renting a guesthouse owned by her parents. Cary Elwes plays Nick, whose attempts to reject Adrian's advances lead to escalating threats and manipulation.

The film marked Silverstone's feature-film debut, although she had already appeared on television, including an episode of The Wonder Years. Her performance earned MTV Movie Awards for Best Breakthrough Performance and Best Villain in 1994. She soon became widely known through Aerosmith music videos and then achieved major stardom as Cher Horowitz in Clueless (1995).

A common mix-up is calling Clueless her debut because it was her best-known early film. Clueless was her breakthrough mainstream comedy, not her first movie.