Height of Popularity: 1989-1991
Then: A fan of colorblocking before it was cool, Zack Morris, Bayside High's big man on campus, was a stud off the set, too. In 2009, Mark-Paul Gosselaar confessed to People Magazine that he dated all three of his female Saved by the Bell co-stars—Tiffani Amber Thiessen, Elizabeth Berkley, and Lark Voorhies (each at different times, of course).
Now: After a series of false starts in an attempt to resurrect his career, the former Mr. Morris landed a coveted role on NYPD Blue in 2001 and bounced around to a few other dramatic programs after its run. In 2011, Gosselaar found his way back to the fast-talking kind of comedy that brought him fame in the first place with Franklin & Bash; the TNT series will make its third season debut later this year.