Lifetime’s upcoming “The Unauthorized Saved by the Bell Story” biopic finally has a trailer. The behind-the-scenes TV-movie is partially based on Dustin Diamond’s 2009 memoir, “Behind the Bell,” despite his later admission that its account was less than accurate. Diamond, who played “Screech” in the series, originally alluded to liberal sexual behavior and drug use among the young cast and adults involved with the show, before retracting his statements and blaming the book’s ghost writer.

The actor served as an executive producer for the made-for-TV movie and Rolling Stone reports “lengthy new interviews” were a basis for the script. According to Lifetime, the movie will “[delve] into the experiences of six unknown young actors placed into the Hollywood spotlight, exposing the challenges of growing up under public scrutiny while trying to maintain the squeaky clean image of their popular characters both on and off-screen.”

The tease (which is hilariously titled, “Blood, Sweat and Raging Teen Hormones”) introduces the “Saved By The Bell” cast just as the early ‘90s teen sitcom picks up steam and success. “Degrassi” actor Dylan Everett stars as Mark-Paul Gosselaar who played the show’s main protagonist, Bayside High student Zack Morris. Sam Kindseth (“Shameless”) stars as Diamond and Tiera Skovbye (“Supernatural”) as Elizabeth Berkley, with newcomers Alyssa Lynch as Tiffani-Amber Thiessen, Taylor Russell as Lark Voorhies, and Julian Works as Mario Lopez, rounding out the cast. And at one point, “Diamond” even throws a punch at “Morris,” while declaring, “I AM NOT SCREECH!” It’s great.

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“The Unauthorized Saved by the Bell Story” premieres Sept. 1 on Lifetime.