In an attempt to bring their family members together, mum and Emma plan for a fun night that soon turns into a freakish nightmare as they cross paths with an evil witch that transforms them into monsters, a family that has a vampire, a werewolf, a mummy, and the disfigured Frankenstein's monster.
As a monster hunter abducts Baba Yaga and Renfield, the members of the Wishbone family set out to save them by transforming once again into monsters, namely a vampire, Frankenstein's monster, a mummy, and a werewolf.