With the help of an ancient Kryptonian power, Lex Luthor unites the Supervillains and captures all Earth's Super Heroes, until…only the Super Hero Girls are left to stop the Legion of Doom. The Super Hero Girls must cross dimensions to rescue their fellow super heroes from the Phantom Zone! After a mix up leads them to the wrong 'universe', the Super Hero Girls find themselves coming face to face with the Teen Titans! The Titans try to help the Super Hero Girls fix their dimension travelling equipment and provide comic relief in the lead up to the movie's climactic showdown.