Following the first clip released earlier this month, Lifetime has debuted the first trailer for their upcoming TV movie The Unauthorized Saved by the Bell Story, which airs Monday, September 1 at 9 PM ET on Lifetime.While Saved by the Bell became a big hit, and made stars out of cast members Mark-Paul Gosselaar, Mario López, Dustin Diamond, Lark Voorhies, Elizabeth Berkley and Tiffani Thiessen, this TV movie explores all of the turmoil behind-the-scenes between these young actors.