Saved by the Bell : Slater's Sister (1992)
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Synopsis by Matthew Tobey
It turns out Slater has a long lost sister, and when she shows up at Bayside, she proves that she's grown up quite a bit since Slater last saw her. As usual, Zack sets his sights on the new girl, but Slater isn't too keen on his rival putting the moves on his younger sibling and intends to come between the lovebirds.