The Halloween Mystery Train is an Other Realm Express train which is used for a murder mystery evening
on Halloween night. Sabrina finds a flyer for this at home and takes her friends on board, mistaking it for a mortal event. All passengers on the train are put under a spell which turns them into their respective characters, one of which is the murder victim, while Sabrina is given the task of solving the mystery. Once the mystery is solved, the spell is undone and all mortal memories are erased. The evening is led by Will; Hilda's future husband. They meet on said train while Hilda and Zelda "interrogated" him.