Zack, Screech, Kelly, A.C. and the gang are back, 20 years after the final bell. E! has picked up the early-’90s sitcom Saved By The Bell and will air it in a two-hour block from 7-9 AM weekdays starting November 11. The show, which aired from 1989-93 on NBC, chronicled the lives of a group of students at Bayside High and their ex-hippie principal (Richard Belding). It helped launch the careers of young actors including Mark-Paul Gosselaar, Mario Lopez, Tiffani Thiessen and Elizabeth Berkley.