‘Pretty Little Liars’

DRAMA. Still looking for Halloween costume inspiration? The ladies of “PLL” might be able to help. The besties — including a still-living Alison, as this special flashback episode is set before she vanished — get glammed up as a witch, Mary Queen of Scots, Pocahontas, Britney Spears and Lady Gaga. Expect plenty of tricks and treats as fans get a better look at some of the secrets these girls have long been hiding.

8 p.m., ABC Family


‘Nature’


FILM. “Radioactive Wolves” isn’t a B horror flick pegged to Halloween. It’s a haunting film of another variety, documenting the wolf packs that roam the “dead zone” around the Chernobyl nuclear site.

Season premiere, 8 p.m., PBS


‘Harry’s Law’


DRAMA. Jason Alexander guest stars as a biology teacher suspended for allegedly failing a kid who rejects Darwinism. Perhaps they can work this out with the Festivus tradition of the Airing of Grievances.

9 p.m., NBC

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