Zack Morris' Marriage Comes to Screeching Halt

Mark-Paul Gosselaar -- the guy who played Zack Morris on "Saved by the Bell" -- has officially filed for divorce from his wife of 13 years, Lisa Ann Russell.

According to documents filed in L.A. County Superior Court, and obtained by TMZ, 36-year-old Gosselaar filed for dissolution of marriage on June 18.

Mark and Lisa have two children together.