Kingdom Hearts - Season 1 Episode 4: Olympus Coliseum

When Sora first enters the Coliseum, Phil (Danny DeVito), who is busy preparing for the games, mistakes him for Hercules (Zac Efron). When his mistake is revealed, Phil allows Sora to enter the trials. Though Sora passes, Phil won't let him enter the games. Disappointed, Sora exits, only to be met by Hades (Michael Keaton), who grants him an entry pass for the preliminaries. Sora then has to go through a preliminary tournament before he can be approved for an actual cup. The final battle of the preliminaries is with Cloud Strife (Lucas Till), who is secretly working for Hades. After defeating or losing to Cloud, Cerberus appears. Hercules holds the beast off until Sora returns and he manages to defeat it, and winning the entrance into the real games.