Yu-Gi-Oh! Episode 66: Slifer the Sky Dragon
Episode 66 of 224 of Yu-Gi-Oh!, aired July 31, 2001, 25 minutes. Available with English subtitles and dub where released.
Episode summary
Strings summons one of the most powerful creatures in the history of Duel Monsters - the Egyptian God Monster Slifer The Sky Dragon. What chance does Yugi's deck have against this unstoppable force.