Justice League x RWBY: Super Heroes & Huntsmen, Part One is the 2023 animated movie crossing over DC Comics' Justice League with Rooster Teeth Studios' RWBY.
From press materials: The Justice League is facing off against a new horror: adolescence! Superman, Batman, Wonder Woman, Flash, Cyborg, Green Lantern and Vixen are surprised to find that not only have they materialized on a strange world called Remnant, but they've also been transformed into teenagers. Meanwhile, the heroes of Remnant -- Ruby, Weiss, Blake and Yang -- find their world has been mysteriously altered. Can the combined forces of the Justice League and Team RWBY return Remnant to normal before a superpowered Grimm destroys everything they know?
The voice cast includes Chandler Riggs (The Walking Dead) as Superman, Nat Wolff as Batman, Natalie Alyn Lind as Wonder Woman, David Errigo Jr. as The Flash, Tru Valentino as Cyborg, Jeannie Tirado as Green Lantern, Ozioma Akagha as Vixen, Lindsay Jones as Ruby, Kara Eberle as Wiess, Arryn Zech as Blake and Barbara Dunkelman as Yang.