Yu-Gi-Oh! Duel Monsters: Season 1, Episode 21

1 - 21: Double Trouble Duel (3)

Yugi and Jonouchi each unleash their strongest monster, Summoned Skull and Red-Eyes B. Dragon, but their strength pales in comparison to the tremendous power of Gate Guardian. Individually, our heroes have no chance, but they will unleash the greatest power of all: teamwork!