It's Halloween at WKIZ when the malicious Mistress of Midnight arrives to host her annual horror movie marathon 'Dead by Midnight'. When the WKIZ staff begins disappearing only to turn up in the increasingly darker films, it's up to line producer Candice Spelling to stop the Mistress of Midnight before her final and most diabolical film goes to air.

Through a series of misunderstandings, Alvin, Simon and Theodore come to believe that Dave is going to propose to his new girlfriend in New York City - and dump them. They have three days to get to him and stop the proposal.

A group of rag-tag paranormal investigators get more than they bargain for when they research an old local urban legend for a disturbed local girl.