Nintendo’s Super Mario Galaxy Movie Sparks Peach–Rosalina Sisters Theory After UK Rating
The upcoming Super Mario Galaxy Movie has just picked up a PG rating from the UK’s classification board, signaling it should be suitable for most audiences while including some mild violence and threats as Mario, Luigi, Yoshi, Peach, and Toad head into space to square off against Bowser and his son.
Curiously, the board’s more-info notes under the theme section mention: “Infrequent very mild upsetting scenes include flashbacks to the separation of a girl and her younger sister.” That phrasing has fans connecting the dots to Princess Peach and Rosalina being siblings, a theory that’s circulated since the original Super Mario Galaxy released in 2007.
The rumor gained steam in part thanks to Rosalina’s expanded profile in the film universe. The 2023 Super Mario Bros. Movie already teased Peach’s non-native origins, with a short scene showing a young Peach arriving in the Mushroom Kingdom in starry attire—an image fans read as hinting at a link to Rosalina and the Lumas.
With Rosalina slated to make a major screen appearance in The Super Mario Galaxy Movie, many watchers saw the new rating clue as a potential confirmation of a Peach–Rosalina sister relationship. A Reddit thread circulating the rating quote sparked a mix of reactions: some fans cheered at the possibility, while others debated whether this would align with or contradict the game lore.
“Peach and Rosalina being sisters would make my daughter happy—she’s been insisting on it for years,” one commenter wrote. “Rosalina feels like the elder sister here; she seems motherly.” Others wondered aloud who the “younger sister” might be, with some speculating Peach.
Not everyone is convinced, though. Critics and fans alike note that the film’s continuity is not the same as the games’ canon. Even if a flashback reveals a Peach–Rosalina backstory on screen, it doesn’t automatically rewrite the established game lore. Some argue the film could tell a separate, self-contained version of events that doesn’t affect future games, while others worry that widespread audience perception could reshape Rosalina’s identity in players’ minds and affect future marketing.
“This could be a neat, film-only take on Rosalina’s backstory, but it might also create confusion about the games’ continuity,” one observer commented. “If Peach and Rosalina are portrayed as sisters on screen, Nintendo might lean into that association in the future, even if it’s not how the games originally set things up.”
At any rate, The Super Mario Galaxy Movie is scheduled to hit theaters on April 1, 2026. In the meantime, you can check our list of the best video game movies of all time and keep an eye on the 2026 release calendar for what’s coming next.