The Marvelous Land of Oz has never had a satisfactory adaptation.
The first sequel to The Wonderful Wizard of Oz introduces arguably the most important Oz character besides Dorothy (at least in the canon) and changes the country forever in the process, yet it has never received its due beyond the page. There have been a good number of adaptations, but none of them have truly portrayed the story of the rise of Ozma and the beginning of a new age for Oz in quite the way it should be.
You know the biggest sign that the adaptations have failed? When L. Frank Baum had a movie production company, OZMA WAS THE FRICKIN' LOGO. SHE WAS THE MGM LION.
And now she's forgotten, and so is the rest of the gang from Marvelous (not named Scarecrow, Tin Woodsman, or Glinda).
Well, I shouldn't say forgotten, as aside from the 1939 gang and the Wicked gang, Ozma and Jack Pumpkinhead are the most popular Oz characters. But does that really mean anything when they've never had a real chance to have their story told?
Return to Oz is a wonderful movie, but it cuts so much out from both Marvelous and Ozma (the book and the character!) that it ends up turning into a Frankenstein. Now, Frankenstein is a great movie, so that's not necessarily bad, but it's not helpful for a faithful adaptation, and drops Jinjur (huge loss), Wogglebug (slightly smaller loss), the Sawhorse (personal loss), the Private and the Hungry Tiger (please pray for the family). Also, Ozma's actor in that film is a transphobe (which is crazy considering she plays OZMA), so that depiction can very much be discarded.
There's Shirley Temple's 60s adaptation, which is surprisingly accurate concerning Ozma and Tip but makes MANY sacrifices to fit its one-hour runtime. Jinjur is cut (for some reason, she, the Army of Revolt, and the Wogglebug are never included), and they add a new character to uncomplicate the story, the traitorous Lord General Nikidik. He hires Mombi to hide the Princess Ozma away (she's already ruling Oz in this version, which raises some questions about the whole Wizard thing), and then everything goes on as normal except no Jinjur... which sucks. But Jack is played by the guy who did Winnie-the-Pooh and Kaa, so that's cool.
Then there's Journey Back to Oz, the animated quasi-sequel to 1939 that casts a kid Liza Minnelli as her mother's most famous character. There's no Ozma at all in this version, but there is a thrall called Pumpkinhead, the ornery Woodenhead Stallion the Third, and our favorite character, the talking SIGNPOST. Oh, and our villain is Mombi in this version (not a combination of Mombi and Langwidere like in Return), and we can't forget her most fearful weapon... her Army of GREEN ELEPHANTS (sorry Jinjur, you got shafted). It's not a good movie, but it is certainly interesting.
Then there are the adaptations I didn't watch like Dorothy and the Wizard in Oz, which is a preschool show set in a world where Dorothy is crowned princess of Oz by Ozma after defeating the Wicked Witch (so three books early). Ozma is there, but it's not her story. Then there's The Wonderful Land of Oz 1969 (reportedly the worst Oz adaptation EVER) where Tip's essence pours into the souls of all little boys, and that's how Ozma shows up because they had to make them exist separately, as if they couldn't be the same person!
And finally, a friend of mine recently introduced me to a stage adaptation of The Marvelous Land of Oz, which was a revelation. The plot is insanely book-accurate (except for that weird part with the Rocs) to the point where it might be too much (Jinjur's portrayal, at least in my opinion, needs a little shifting from the book to avoid disparaging an important cause), but it is wonderful otherwise. Great costumes, great sets, great actors, great songs, and all done by the Children's Theatre and School of Minneapolis! Their adherence to the source material is a breath of fresh air, as it is the only adaptation I have seen that has gotten Tip and Ozma right, even to the point of having them portrayed by the same brilliant young actor. Its only two faults are its perhaps overadherence to the source material and that it doesn't have more recognition, which is why I do not consider it an adaptation that truly does justice to the narrative.
The Marvelous Land of Oz has never received a satisfactory adaptation. It has been mined for parts, pushed aside, and forgotten, but no non-print adaptation has ever fully recognized its potential. Marvelous is a story about a country trying to figure out who it is after years of oppression. It's a story about the new generation replacing the old, with both good and bad consequences. It is a story of the overlooked child who saves the country that forgot they existed, the disregarded youth who transitions into a tenacious queen. It is about identity and change, and though it may not be perfect, it has never received an adaptation that took those elements and uplifted the story. I hope someone will take this story and elevate it to where it has always been able to reach. And if others do not, someday I hope I can manage it.