Zack Morris is officially coming back to Bayside. Mark-Paul Gosselaar has closed a deal to return for streamer Peacock's forthcoming
#SavedbytheBell revival
https://t.co/oe7JDP7hJp- The Hollywood Reporter (@THR)
January 10, 2020 Mark has closed a deal to star in three episodes (the maximum number of episodes he's allowed to appear in since he's a regular on Mixed-ish) and is also an executive producer. Tiffani Thiessen is also in talks to return.
Source