-Asgardian Ship
Thanos and his children attack the asgard ship. Heimdall sends Hulk to Earth with the Bifrost after he is defeated by Thanos but Thanos kills Heimdall. Loki tries to fight back but Thanos kills him and gets the Space Stone before he and his Children leave Thor for dead. Thanos' ship fires on the Asgard ship and destroys it.
-Earth, New York
Tony Stark aka Iron-Man meets up with Doctor Strange, Wong, and Bruce Banner. They take him to the Sanctum Sanctorum. Strange tells Stark about Thanos' plan to get the six Infinity Stones. Suddenly, Ebony Maw and Cull Obsidian attack the city. Strange and Wong fight Maw while Hulk and Iron-Man fight Cull. Cull almost kills then when Spider-Man aka Peter Parker comes to the rescue. Meanwhile, Wong and Strange are defeated by Maw. Maw takes Strange away but Spider-Man swings after them. Spider-Man is beamed up by the alien ship's tractor beam. Wong blasts Cull into a portal in the Arctic and Iron-Man saves Spider-Man with the Iron-Spider suit. Iron-Man and Iron-Spider rescue Strange and defeat Maw before deciding to take the fight to Thanos.
-Scotland, UK
Proxima Midnight and Corvus Glaive attack Scarlet Witch aka Wanda Maximoff and Vision but are stopped by Captain America aka Steve Rogers, Black Widow aka Natasha Romanoff, and Falcon aka Sam Wilson. They go to Wakanda to destroy the Mind Stone in Vision's head without killing him.
-Collector's Museum
The Guardians of the Galaxy, Star-Lord aka Peter Quill, Gamora, Drax, Nebula, and Mantis meet Thor. Thor goes with Rocket to Nevidiller to build Stormbreaker while the Guardians go to the Collector's Museum to fight Thanos. Thanos kills the Collector and gets the Reality Stone. Gamora gets captured and taken to Thanos' ship.
-Vormir-
Thanos sacrifices Gamora on Vormir to get the Soul Stone.
-Wakanda-
Cap's team fight Proxima Midnight and Corvus Glaive's army of Outriders to buy time for Shuri to get the Mind Stone out of Vision's head and destroy it. Okoye, Black Widow, and Scarlet Witch defeat Proxima. Corvus tries to break into the lab but Falcon swoops in and fights him. Falcon eventually shoots down Corvus with his pistol. Meanwhile, the rest of Cap's team, the Wakandans, and Black Panther are losing when Thor and Rocket show up. The tide turns and they defeat the Outriders. Shuri gets the Mind Stone out of Vision and Scarlet Witch destroys it but Vision is still alive.
-Titan-
Iron-Man, Spider-Man, Strange, Star-Lord, Drax, and Mantis prepare to fight Thanos. When they fight, they are losing but Nebula joins to help. Nebula tells Star-Lord Gamora died like in the movie and Star-Lord gets angry but Strange uses the Time Stone to freeze time before he uses his magic whip to yank the gauntlet away from Thanos and traps him in whips before starting back time again. Thanos tries to break free but Strange blasts him into a portal. Thanos is sucked into a fire dimension and is eaten by a fire dragon. After the fight, they go back to Earth in Maw's ship and reunite with Cap's team on Wakanda. Iron-Man and Cap manage to make peace with each other and they become friends again so now the Avengers are no longer divided. Thor goes off of Earth with the Guardians of the Galaxy and the rest of the Avengers celebrate.