Tonight, Mark-Paul Gosselaar Zack Morris was a guest on the show!! Not only is he so ON for the reunion, he sang an old Zack Attack hit "Friends Forever" with The Roots. This was amazing. (Also, ANOTHER cast member signed on for the reunion during the segment. Watch to find out which one it is.)
I think we can safely say here that Mark-Paul Gosselaar is the tops, right?
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