The McPhearson Phantom is the ghost of a woman whose husband was thrown to The Loch Ness Monster by Ma's great-great-aunt. The ghost thought it was Muriel's great-great-aunt who committed the crime. She then decided to break up Muriel and Eustace's marriage by playing several tricks on Eustace. Ma (posing as a therapist) wanted to break up their marriage also. The two started working together, until it was revealed that it was Ma's great-great-aunt who threw her husband into the Loch Ness Monster, not Muriel's. The Phantom then stoped trying to ruin the Bagges' marriage, and decided to have revenge on Ma.
- Her black ghost appearance resembles Oogie Boogies in his shadow form.