Realm Guardians: Uniting Worlds Against Darkness

Super Smash Bros. X Don Bluth X Pretty Cure X Kingdom Hearts: Revenge of Mr. Dark is Sarah West's big collaboration of Nintendo, Sega, Capcom, Bandai Namco, Konami, Activision, Ubisoft, Don Bluth, Pretty Cure, Disney, Final Fantasy, and The World Ends With You.

gameplay
you can play as Sarah West, or your custom create a key blade wielder (male or female), along with some party members in your ally side against Mr. Dark to save the worlds of Nintendo, Sega, Capcom, Bandai Namco, Konami, Activision, Ubisoft, Don Bluth, Pretty Cure, Disney, Final Fantasy, and The World Ends With You.

opening and ending songs

 * Somewhere Down The Road by Barry Manilow (1981) (the opening song for the crossover)
 * Dreams to Dream by Linda Ronstadt (1991) (the ending song for the crossover)