S1·E5 Out of My Mind

Beetlejuice and Lydia have a fight, and Lydia banishes the ghost to the Neitherworld. Beetlejuice foolishly makes the comment that he can't get Lydia out of his mind, and accidentally teleports her there. Lydia meets up with Beetlejuice's wimpy Will Power and overbearing Prank Factor--can she convince Will to stand up to Prankenstein? And how will she ever get out of Beetlejuice's head?