What’s more tantalizing than mud being flung on a reality show? The sordid behind-the-scenes stories from some of the 1990s most popular TV shows. At least that’s what one network hopes.

On the heels of last year’s “Saved by the Bell” expose come two telefilms delving into the gossipy stories behind some beloved shows. Audiences can thank a channel aimed at women for these dubious pleasures. Lifetime is producing both the upcoming “Unauthorized Beverly Hills, 90210 Story” and Saturday’s premiere of “The Unauthorized Full House Story.”

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Among the tidbits to be shared on the “Full House” expose — co-star John Stamos tried to have the pint-sized Ashley and Mary-Kate Olsen twins fired from the show.

The channel clearly thinks these attempts at re-opening old wounds, and tripping our nostalgia sensors, will connect with viewers. Yet its “Saved by the Bell” expose, based on co-star Dustin Diamond’s memoir, drew meager ratings last Labor Day. Perhaps nostalgia has an expiration date.

Perhaps nostalgia has an expiration date.

The ’90s shows in question all featured youthful, attractive casts and drew big audiences despite critical misgivings. The “Full House” Lifetime project will likely get a boost from Netflix’s plans to update the family friendly series via its upcoming “Fuller House” reboot.

The show, set to air sometime next year, brings back most of the original cast minus the Olsen twins. The story focuses now on DJ Tanner (Candace Cameron Bure), a widow with two children and a third on the way. Enter Stephanie Tanner (Jodie Sweetin) and Kimmy Gibbler (Andrea Barber), all grown up and moving in with DJ to lend a hand.

“The Unauthorized Full House Story” airs at 8 p.m. Eastern Saturday on Lifetime. The telefilm stars Garrett Brawith as Bob Saget (Danny Tanner), Justin Mader as Dave Coulier (Joey Gladstone), Justin Gaston as John Stamos (Uncle Jesse) and Stephanie Bennett as Lori Loughlin (Rebecca Donaldson).