Yu-Gi-Oh! - Episode 129

Major Events

Second Duel of the "Battle City" Semi-Finals.
Yugi and Kaiba Duel in a hologram of an ancient Roman coliseum.
When "Slifer the Sky Dragon's" attack misses, it hits the skyline causing lightning bolts to shoot down from the sky. This reactivates the power levels of Seto's blimp, allowing Mokuba to call a helicopter for Joey and activating the broadcast of the Duel on Battle City's giant screens.
When "Slifer the Sky Dragon" and "Obelisk the Tormentor" clash, a vision of the past is displayed to Yugi and Seto's minds.
Spanning over 6 episodes, this duel is one of the longest in the Yu-Gi-Oh! anime.

=Featured Duel: Yami Yugi vs. Seto Kaiba - Part 1

Summons "X-Head Cannon" (1800 ATK / 1500 DEF) in Attack Position.
Activates Continuous Spell Card "Spell Sanctuary", allowing both players to add a Spell Card from their Deck to their hands: Yugi selects "Change of Heart"; Seto selects "Soul Exchange". From now on as long as "Spell Sanctuary" remains in play, both players can activate any kind of spell card during their opponent's turn, as long as it is face down.
Sets a card.

Activates Spell Card "Soul Exchange" to take control of Yugi's two monsters (NOTE: in the real game, "Soul Exchange" has a different effect). Now with the three monsters under his control, he intends to Tribute them all in order to summon "Obelisk the Tormentor" to the field.
Yugi activates Spell Card "Change of Heart", taking control of Seto's "X-Head Cannon" until the end of the turn, thwarting Seto's plans.
Seto activates Quick-Play Spell Card "Enemy Controller", paying 1000 LP (Seto: 4000 → 3000 Life Points) to take back control of "X-Head Cannon" (NOTE: In the real game, "Enemy Controller" allows you to either take control of an opponent's monster, or switch its battle position; if you choose the "take control" effect you must tribute one monster you control)
Yugi activates Trap Card "Lightforce Sword", removing "Obelisk the Tormentor" from Seto's hand for three turns. (NOTE: in the real game, "Lightforce Sword" selects a card from your opponent's hand *at random*).

First turn that "Lightforce Sword" is keeping Seto's "Obelisk the Tormentor" removed from the game (3 turns remaining).
Summons "Y-Dragon Head" (1500 ATK / 1600 DEF) and activates its special effect to equip it to "X-Head Cannon", increasing the latter's ATK/DEF by 400 ("X-Head Cannon": 1800 → 2200 ATK / 1500 → 1900 DEF)
Attacks and destroys Yugi's "Alpha The Magnet Warrior" with "X-Head Cannon".
Activates Spell Card "Lullaby of Obedience", paying 1000 LP (Seto: 3000 → 2000 Life Points) to take "Slifer the Sky Dragon" from Yugi's Deck and add it to his hand.
Yugi activates Spell Card "Exchange", allowing each player to take a card from the other's hand: Yugi selects "Slifer the Sky Dragon"; Seto selects "Life Shaver".