Mark-Paul Gosselaar was very nervous about the return of Zack Morris on Late Night With Jimmy Fallon this week.

“I haven’t been that anxious or nervous to do a role in a long time. To be in front of a studio audience. I still remember my first day of doing Saved by the Bell, not Good Morning, Miss Bliss, because that wasn’t in front of a studio audience,” Mark explains of the return of his Saved By The Bell alter ego on Monday’s Fallon. “But on “Saved by the Bell,” my very first opening scene that I talk to the camera, I remember how nervous I was for that and that’s about how nervous I was for this tonight. I kind of got into the character once I put on the hair and clothes. My stance completely changes, you stand very upright with fingers in the pockets. You also have to erase all the frown lines on your face because Zack was just very happy. It was fun. It was fun to jump back into that character.”