Metroid/Pokemon

Cast

 * Mario (from Mario) as Pikachu
 * Pikachu (from Pokemon) as Piplup
 * Knuckles (from Sonic) as Buizel
 * Samus as Buneary
 * Zero Suit Samus as Jigglypuff
 * Shadow (from Sonic) as Meowth
 * Sonic (from Sonic) as Gligar
 * Ridley (from Metroid) as Mewtwo
 * Luigi (from Mario) as Sudowoodo
 * Uncle Chuck (from Sonic) as Chimchar
 * Wario (from Mario) as Squirtle
 * Lucas (from Earthbound/Mother) as Pichu (Pichu Big)
 * Ness (from Earthbound/Mother) as Pichu (Pichu Little)
 * and more