On cheesy teenage sitcoms, reality can be fungible. Saved by the Bell often let its main characters provide the soundtrack, but it wasn’t fussy about the format: the gang lip-synched tunes at sock hops, costume balls and in their own homes. The girls cut a workout-themed music video and nearly landed a record deal, until Jessie Spano showed America what happens when you dabble with pills. But the pinnacle of the show’s musical obsession was a Casey Kasem-hosted episode chronicling the Zack Attack’s dizzying rise from garage band to worldwide pop sensation. The plot was plucked straight from Behind the Music: there were strobe-lit concerts, asinine press conferences, regrettable hairstyles, a British producer, a manipulative publicist, an award show speech that revealed the group’s impending fractures, and — finally — the profound realization that fame changes people. In true early-’90s TV fashion, though, it turned out the whole thing was just a dream.