Twenty years after it all began, the cast of Saved By The Bell has reunited on the pages of the new issue of PEOPLE Magazine.

Mario Lopez (Slater), Mark-Paul Gosselaar (Zack), Elizabeth Berkley (Jessie), Tiffani Thiessen (Kelly) and Lark Voorhies (Lisa) are back together in celebration of their days as the face of NBC’s Saturday Morning TNBC lineup.

But where is Dustin Diamond, who played curly-topped nerd Screech on the series? Now a stand-up comedian, Diamond tells PEOPLE he is no longer close with his castmates and did not want to join them on the reunion cover.

He’s currently working on a tell-all called Behind the Bell.

To find out what the Saved By The Bell cast has been up to in recent years, pick up PEOPLE this Friday, July 31.