The Return of Zach Morris!

No, you haven't time-warped back into the early '90s -- but Mark-Paul Gosselaar has!

The actor transformed himself back into Saved By the Bell's Zach Morris for an appearance on Late Night with Jimmy Kimmel last night -- and, wow, he hasn't aged a bit!

Zach Attack caught the talk show host up on what he's been up to, telling Jimmy, "It's been a long strange trip since my days at Bayside, but hey, I can't complain." He even talked about his romance with Kelly and played with the house band.

I love when an actor pays homage to the roles that made them famous in the first place. Ya hear that, Luke Perry?