Charlie Baileygates (Jim Carrey), is a 17-year veteran of the Rhode Island police force. Charlie is mild-mannered, hard-working, always helpful, and a devoted and loving father to three sons. Unfortunately, Charlie has Split Personality Disorder, and when he runs out of his medication …

Out pops Hank Baileygates (also Jim Carrey), Charlie’s hyper-aggressive alter-ego. Hank’s got a filthy mouth, drinks like a fish, breaks skulls and loves dirty, dirty sex. Charlie and Hank have nothing in common … with the exception of Irene Waters (Renee Zellweger), a beautiful woman on the lam with whom they’ve both fallen in love. Now, Hank/Charlie must wage war – with himself – for the confused. Irene’s affections.