Slifer the Sky Dragon (manga character)

Slifer the Sky Dragon, known as Osiris the Sky Dragon (オシリスの Oshirisu no Tenkūryū) in the Japanese version, is a character in the Yu-Gi-Oh! manga. It is one of most powerful monster spirits, the Egyptian Gods. Its corresponding Duel Monsters card is "Slifer the Sky Dragon", known as "Saint Dragon - The God of Osiris", in the Japanese version.

Ancient Egypt
Slifer is one of the three Egyptian Gods, along with Obelisk the Tormentor and The Winged Dragon of Ra. These monsters were only capable of being summoned by the Pharaoh.

When Atem spotted Bakura, King of Thieves fleeing from the palace after he had attacked Aknadin, he chased after him on horseback and Summoned Slifer to fight Bakura's Diabound. Atem allowed Slifer to be struck in order to protect innocent civilians from Diabound's attacks and then got Slifer to force the battle into the sky. However Diabound was able to disappear into the darkness and attack Slifer from behind. Atem pretended to surrender his Millennium Pendant in order to distract Thief Bakura while he had Slifer sneak up on him. However Bakura got Diabound to make a similar sneak attack on the Pharaoh. After the priests arrived, Atem sacrificed Slifer, so that Seto's Duos could attack Diabound, but Duos wound up hitting a decoy ka instead. By defeating Slifer, Diabound gained its power, including its "Thunder Force" attack.

Battle City
3000 years later, Maximillion J. Pegasus created cards depicting the three Egyptian Gods, for his game Duel Monsters. However the souls of the Gods came to dwell in the cards, making them powerful weapons. On realizing this, Pegasus regarded their creation as one of his greatest mistakes. He tried to destroy the God Cards, but could not bring himself to do it, so he had the Egyptian supreme council of antiquities bury the cards in different locations in the Valley of the Kings. The Ghouls managed to steal the "Slifer the Sky Dragon" and "The Sun Dragon Ra" cards. However the Egyptian supreme council of antiquities was able to prevent them finding "The God of the Obelisk". Ishizu Ishtar, from the council, later gave it to Seto Kaiba, so that he would host the Battle City tournament to retrieve the other two.

The leader of the Ghouls, Marik Ishtar entered the Battle City tournament with the "Slifer" and "Ra" God cards. Using The Doll as his puppet, he Dueled Dark Yugi in the preliminaries and used "Slifer the Sky Dragon" in the Duel. However Dark Yugi won the Duel and received the "Slifer" card through the tournament rules.

Dark Yugi used "Slifer the Sky Dragon" in his semi final Duel against Dark Bakura. Summoning it and attacking Dark Bakura became Dark Yugi's only way of winning the Duel. Marik exploited this, by having Dark Bakura remove his control over Ryo Bakura's body. Ryo, who was injured and significantly weaker than Dark Bakura would not be able to withstand an attack from Slifer, making Dark Yugi reluctant to attack. However, Dark Bakura took back control of Ryo's body and urged him to attack, assuring him Ryo would be okay.

During Dark Yugi and Kaiba's semi final Duel, when their cards "Slifer the Sky Dragon" and "The God of the Obelisk" destroyed each other, they were shown a vision of a past battle between Pharaoh Atem and Priest Seto.

Dark Yugi also used Slifer in his final Duel against Dark Marik.

Project R.A.
When Yako Tenma Dueled Dark Yugi for the first time, Yugi Summoned "Slifer" by sacrificing his "Magnet Warriors", though Yako remained calm and proceeded to Summon his own "God card", "The Wicked Avatar", which was initially in the shape of a black orb before taking on "Slifer's" form. Yugi attempted to use "Slifer's" second mouth to destroy "Avatar", but the effect failed as "Avatar" was higher on the divine Hierachy. "Avatar" then destroyed "Slifer" with a single attack, later revealed to be due to the "Avatar's" capability to take on the highest ATK on the field plus one.

Although consistently mentioned alongside the other Egyptian Gods, "Slifer" only made one more appearance, being used to offhandedly defeat Cedar Mill as Dark Yugi and Gekko Tenma raced to the top of the Kaiba Corporation building.

Memory World
When Dark Yugi entered the Memory World, he relived some of his life as Pharaoh Atem, and fought the battle against Thief Bakura, in which he summoned Slifer, again.

Atem summoned the three Gods from the cards in Yugi Mutou's Deck. He then combined them into The Creator God of Light, Horakhty, who defeated Zorc.

Yugi and Atem constructed separate Decks for the Ceremonial Battle, which Atem needed to lose in order to pass on to the afterlife. Despite needing to lose, Atem gave the Duel his all. He included Slifer in his Deck, but was still defeated by Yugi.