Saved by the Bell's 20-Year Reunion!

From Zack & Kelly to A.C. Slater, PEOPLE catches up with Bayside's Class of '89!

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MARIO LOPEZ, 35

Known as stud A.C. Slater, Lopez's biceps drew plenty of attention on Bell, but it was his distinctive hair that raised eyebrows. "I liked my hair long because I wanted to look like Mel Gibson in Lethal Weapon," says Lopez, who now hosts Extra. "I didn't even know I had a mullet!"