Disney has gotten a lot of mileage and scads of TV viewers out of the “Descendants” franchise, made-for-TV fairy tale musicals with a sort of “‘High School Musical’ meets ‘Wicked'” ‘vibe.

The series of films started with Broadway queen Kristen Chenoweth in the cast and “High School Musical” veteran Kenny Ortega directing, lots of fantasy fashion forward costumes and music-video-style production numbers to showcase pleasant-enough pop tunes to help tell the story, set up each principal character and lay out their intentions.

Now we’re up to the fourth film, “Descendants: The Rise of Red,” with Brandy Norwood and Rita Ora among the stars and veteran TV director Jennifer Phang behind the camera. It’s on a par with the earlier films — in other words, pretty forgettable for adults if not for the tweens who eat this cotton candy up.

The conceit is that fairy tales all exist in the same Disney universe, and that whatever went on with Sleeping Beauty, Cinderella, Peter Pan, Aladdin or Alice’s “friends” in Wonderland, their children have their own stigmas and agendas for overcoming them.

Red, played by Kylie Cantrall of TV’s “Gabby Duran and the Unsittables,” is a rebellious teen trapped in Wonderland under the thumb of her ruthless mom, The Queen of Hearts (Rita Ora). Red stays sane by playing pranks and being generally uncooperative. Her “escape” might be a letter of invitation to enroll at Auradon Prep, the big high school for privileged kids from assorted fairyale kingdoms.

It’s usually where heroines and heroes are educated. But new headmistress Uma (China Anne McClain), the pirate leader of assorted Lost Boys and daughter of Ursula, the Little Mermaid sea witch, is here to institute a “villains, too” policy.

But mean ol’Queen Mom, freed from fending off the accidental challenges Alice might have presented her in Wonderland, drops Red off and promptly stages a coup.

Mom has a grudge against Cinderella (Brandy Norwood), something to do with a prank back when they were at Merlin Prep. Cinderella’s handsome prince-turn-King Charming husband (Paolo Montalban) can’t save her. Can her sweet daughter, Chloe (Malia Baker) and bratty Red put aside their differences long enough to change Mrs. Glass Slippers’ fate at the hands of Queen “Off With their Heads?”

Red’s one ally back in Wonderland, Maddox aka “Mad” Hatter (Leonardo Nam) loaned her his “time machine” pocket watch. The girls find themselves hurled back to when their parents were in school. Red and Chloe must stop Red’s then-sweet-and-innocent-teen Bridget (Ruby Rose Turner) from being pranked by “Ella” (Morgan Dudley) or whoever it was that traumatized her, way back when.

The message, that “Hurt People Hurt People,” could not be clearer. “Privilege” is poked any time poor “Ella” aka Cinderella reminds Red and others that “You are a girl, but your princess is showing!”

The references to fairytale characters in their school days — Aladdin and Jasmine, etc — are too clumsily handled and obvious to be cute, with or without the “Bippidy, boppedy Boo.” The “plot,” such as it is, labors along towards its inevitable big “Castlecoming (homecoming) Dance” payof, which isn’t anything of the sort.

But grand Medieval steam punk clubwear costumes and faaaabulous wigs adorn the players as they sing and bounce through Ashley Wallen’s choreography for eight or so tunes by Torin Borrowdale, songs with forgettable if amusingly insipid lyrics like “The sun shines a little more brightly when you’re taking things a little more lightly.”

That’s how to take these childish but almost wry fantasies — “lightly.”

That next big stage or screen musical is going to need an audience, and Disney has spent decades growing it, from “The Little Mermaid” through “High School Musical” to “Descendants I-IV.”

Such entertainments have historically been stuffed with forgettable filler, plot-advancing tunes that few remember outside of those who performed “Camelot” in community theater or joined the “Les Mis” cult at some point.

There’s little to “The Rise of Red” meant to stick in the memory, and no “devil on my shoulder and it won’t be quiet” tune is going to create an earworm, even for kids watching it over and over again. It’s all just (almost) good, clean and forgettable “fun,” for those young enough to be delighted by it.

Rating: G

Cast: Kylie Cantrall, Malia Baker, Brandy Norwood, China Anne McClain, Dara Reneé, Ruby Rose Turner, Jeremy Swift, Leonardo Nam and Rita Ora.

Credits” Directed by Jennifer Phang, scripted by Dan Frey and Ru Sommer. A Disney+ release.

Running time: 1:32