Sabrina tries to teach Ambrose and Shinji how to play a board game called Creatures and Caves, where players pretend to be magical creatures in an imaginary world. Enchantra angrily has Sabrina put the game away. Back in the human world, Sabina is invited to be in a live-action version of the game along with Amy, Jim and Harvey. Aunts Zelda and Hilda warn Sabrina of a hidden portal to Witch World in the woods.
While playing, Harvey stumbles onto the open portal and enters the magical world of Witch World. As it is a full moon in the magical world, Harvey becomes a werewolf for a third time. Sabrina follows to find and save Harvey before it's too late. The game soon becomes harsh reality when Jim and Amy go into Witch World as well, trying to find their way home, believing that it is only game. Enchantra is told by Shinji that one of Sabrina's human friends' is a werewolf, which causes Enchantra to carry out a sinister plan for Harvey to remain a werewolf forever. Sabrina finds a troll talking to another troll (who is actually Enchantra using her magic to mimic the troll's voice)) who orders him to safeguard a magic pool, which will cure the werewolf, if one falls in. Sabrina manages to take Harvey to the pool and he turns back to normal at last.
- This indicates Harvey 's third and final magical transformation into a werewolf.