In 2001, Gosslaarr returned to television as Detective John Clark in the ABC crime drama NYPD Blue. In 2008, Gosselaar joined the cast of the new TNT drama Raising The Bar.

During a June 2009 appearance on Late Night with Jimmy Fallon Gosselaar agreed to participate in Fallon's Saved by the Bell reunion. Elizabeth Berkley, Mario Lopez, Lark Voorhies and Dennis Haskins had previously committed to the reunion. EW: Mark-Paul Gosselaar Does Fallon Interview (June 9, 2009)

• 2008-current: Jerry Kellerman in Raising the Bar
• 2007: Jake Ferris in John From Cincinnati
• 2005-2006: Richard 'Dickie' McDonald in Commander in Chief
• 2001-2005: Det. John Clark, Jr. in NYPD Blue
• 2000: Pete Komisky in D.C.
• 1998-1999: Dennis Sweeny in Hyperion Bay
• 1993-1994: Zack Morris in Saved by the Bell: The College Years
• 1989-1993: Zach Morris in Saved by the Bell
• 1988-1989: Zach Morris in Good Morning, Miss Bliss

• "I like school. It's just too bad classes get in the way. - Zack IMDb
• "This week is our Geometry midterm. Hey, I'm not worried, I always sit next to smart nerds." IMDb
• "This looks like a job for, Zack-man.", Zack Wikiquote