THEN: Mark-Paul Gosselaar as 'Zack Morris'
Mark-Paul Gosselaar played the Bart Simpson of Bayside, Zack Morris. A "preppy" schemer, Zack was best known for his backfiring antics, his huge cell phone, his love for Kelly, his distaste for Belding and his ability to make time stand still. Literally. —XFINITY Entertainment Staff (Photo: NBC)
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