Brought back from a doomed space mission, an army of giant rats develop a big appetite for Los Angeles residents.

Killjoy is back in the fourth installment of the demonic clown series. This time Killjoy is being accused of not being evil, since he let one of his victims(Sandie) get away. Killjoy must rely on his only chance of proving how evil he really is… get Sandie into hell as his witness.