World series (7:30 P.M., FOX): Break out the peanuts and Cracker Jack. Baseball’s World Series

World series (7:30 P.M., FOX): Break out the peanuts and Cracker Jack. Baseball’s World Series begins tonight in the home ballpark of the National League champion. Joe Buck and Tim McCarver call the action.

“pretty little liars” (8 p.m., abc family): A special prequel episode of “Pretty Little Liars” promises plenty of tricks and treats for the show’s fans. It focuses on the Halloween before Alison (Sasha Pieterse) went missing as she faces a possible challenger to her queen-bee status.

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