Having acquired the Power Stone from the planet Xandar, Thanos and his children—Cull Obsidian, Ebony Maw, Proxima Midnight and Corvus Glaive—intercept the ship carrying the survivors of Asgard’s destruction.[N 1] Thor, Loki, Heimdall and Hulk are powerless to protect the Asgardians. Heimdall summons the Bifröst to send Hulk to Earth before being killed by Thanos. Loki gives Thanos the Tesseract to spare Thor’s life, but is killed after attempting to kill Thanos, who departs with his followers and obliterates the ship.
Hulk crash-lands at the Sanctum Sanctorum in New York City, reverting to Bruce Banner. He warns Stephen Strange and Wong about Thanos’ plan to kill half of all life in the universe. In response, Strange recruits Tony Stark. Maw and Obsidian arrive to retrieve the Time Stone from Strange. After a battle including Peter Parker, Maw captures Strange; Stark and Parker pursue Maw’s spaceship, while Banner contacts Steve Rogers.
In Scotland, Midnight and Glaive ambush Wanda Maximoff and Vision. Rogers, Natasha Romanoff and Sam Wilson rescue them, and they take shelter with James Rhodes at the new Avengers Facility. Vision offers to sacrifice himself by having Maximoff destroy the Mind Stone in his forehead to keep Thanos from retrieving it. Rogers suggests they travel to Wakanda, which he believes has the resources to remove the stone without destroying Vision.
The Guardians of the Galaxy respond to a distress call from the Asgardian ship and rescue Thor. He surmises Thanos seeks the Reality Stone, which is in the possession of the Collector at Knowhere. Rocket and Groot accompany Thor to Nidavellir to retrieve a weapon capable of killing Thanos. There, they and Eitri create Stormbreaker, an enchanted axe that can summon the Bifröst. Peter Quill, Gamora, Drax, and Mantis find Thanos at Knowhere with the Reality Stone already in his possession. Thanos kidnaps Gamora, his adoptive daughter, who reveals the location of the Soul Stone to save her captive adoptive sister Nebula from torture. Thanos and Gamora travel to Vormir, a planet where Red Skull, keeper of the Soul Stone, informs him the stone can only be retrieved by sacrificing someone he loves. Thanos reluctantly throws Gamora to her death, granting him the Soul Stone.
Nebula escapes captivity and requests the remaining Guardians meet her on Titan, Thanos’ destroyed homeworld. Stark and Parker eject Maw from his ship and rescue Strange. Landing at Titan, they meet Quill, Drax, and Mantis. Strange uses the Time Stone to view millions of possible futures and states there is only one in which Thanos loses. The group forms a plan to confront Thanos and remove the Infinity Gauntlet. Thanos arrives, justifying his plans to Strange as necessary to ensure the survival of a universe threatened by overpopulation. The group subdues him until Nebula deduces Thanos has killed Gamora. Enraged, Quill retaliates, which breaks the group’s hold on Thanos, and he overpowers them. After Strange surrenders the Time Stone in exchange for Thanos sparing Stark, Thanos departs for Earth.