THE GOLDBERGS 8 p.m. on ABC. This family sitcom delights in its commitment to its “1980-something” time period (as the narrator announces every episode), with Reebok Pumps, Atari and Garbage Pail Kids galore. But this episode will need a new set of cultural touch points, as the scene jumps forward a decade to “1990-something.” The Goldberg children have graduated, but the teachers of William Penn Academy remain, and Beverly Goldberg (Wendi McLendon-Covey) unsurprisingly continues to throw herself into school affairs. The episode was originally meant to be the pilot of a spinoff series, but ABC declined; Tim Meadows, Nia Long and Bryan Callen star as the school’s staff.

SCHITT’S CREEK 8 p.m. on Pop. Another family sitcom, but this one is not quite so family-friendly: The raunchy story of a wealthy clan that hits rock bottom returns for its fourth season on Wednesday. (Eugene Levy and Catherine O’Hara star as the parents.) And the series premiere of LET’S GET PHYSICAL, which lunges into the world of 1980s aerobics, follows at 8:30.

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