The infamous, Most Wanted Goosebumps characters are out on the loose and after you. Kelli and Shawn Anderson are not excited about having to move to another state - especially because their new home is directly next to a giant swamp. But their dad is a scientist and he's going down there to study the local flora and fauna. Unfortunately for Kelli and Shawn, there seem to be some very strange creatures that live around their house. They keep hearing...

When their scientist father moves them to a new home next to a swamp, Kelli and Shawn hear stories about a terrifying, ancient beast that inhabits the muck and the pair try to convince their father to move them out before it strikes.