Sabrina takes a holiday idea from Salem and brings her friends on the spooky Mystery Train for a Halloween adventure. There's just one problem: It's in the Other Realm. Sabrina soon learns that the mortals can leave only if she solves the puzzling mystery when she goes back into something out of a 1920 mystery movie.

Max and Logan must set aside their complicated and lethal feelings for one another, when they investigate a series of unusual deaths and uncover a genocidal agenda linked to transgenic escapees.

When arriving party guests find a prominent doctor murdered and his wife raped, the investigation starts with his estranged son and a former patient, then moves to his mistress and her neighbor and the realization that the wife was the intended victim.

A village is having a Wobbuffet festival where battles aren't allowed but gatecrashers soon arrive.

Ash, Misty and Brock encounter Duplica again with a new Ditto who can transform into miniture versions.

The kids get worried when the normally cool and collected teacher Hank McCoy starts having fits of animal rage.

Colette tries to persuade Josh not to quit his job as he attends the funeral of Danny Orfield as Chloe struggles under the strain of doing two jobs.