When Christopher and Molly Jordan discover that the evil spirit of Belthasar has secretly passed through the timedoor and lives in their world, life is turned upside down. When Belthasar's spirit inhabits a famous movie star and thinks about staying in this world forever, life may never be the same again! With help from the magician Artemas, the Jordan siblings coax their adversary out of hiding, only to discover that Belthasar plans to recreate another copy of himself and establish a kingdom in Endora. Christopher and Molly, along with their family and friends, face their greatest peril ever.