Warning: This post contains SPOILERS for Avengers: Infinity War.
Avengers: Infinity War features several different planets and locations, thus making it one of the most cosmic movies to date within the Marvel Cinematic Universe. Since the movie focuses on Thanos's quest to obtain all six Infinity Stones, he and his loyal Black Order were required to travel all over the galaxy in search of them.
Although Infinity War is technically Thanos' movie, Thanos and his children weren't the only characters moving between locations throughout the film. And while two of the locations are places that MCU fans should be quite familiar with, the rest of the them are all new.
As with most Marvel Cinematic Universe movies, Earth plays an integral role in Infinity War, acting as the location of two Infinity Stones: the Mind Stone and the Time Stone, though the latter ended up coming to Thanos directly later on in the film. Although much of the film takes place in other parts of the cosmic universe, Earth becomes the central location at the start and the end of the film; first in New York and then later in Wakanda.
It was revealed long before Infinity War's release that Wakanda would be the third act's focal point, being the safe haven for Vision (and his Mind Stone). And since Wakanda had never been conquered in its history, it seemed like the ideal place to stage a final battle.
Knowhere isn't exactly a planet; it's the severed head of a celestial that became occupied by Taneleer Tivan, aka the Collector, and the Tivan Group. It was technically first seen in 2014's Guardians of the Galaxy, even though the Asgardians delivered the Reality Stone to the Collector in the credits scene for 2013's Thor: The Dark World. After some deduction, Thor presumed Thanos would be going after the Reality Stone next, which is what he tells the Guardians.
Gamora and the rest of the Guardians wanting to prevent Thanos from obtaining the Reality Stone makes the most sense, which is why they go back to Knowhere to find the Collector and take the Stone from him - but they were too late.
While all the planets and locations in Avengers: Infinity War were or could've been predicted prior to release, Vormir is the only place no one saw coming, mostly because no one knew where the Soul Stone was located. The Stone's location was one of the biggest questions leading up to Infinity War's release - and it was finally revealed to be on Vormir, a planet located in the Kree Galaxy in the comics.
When Thanos and Gamora arrive on Vormir, they are confronted by a man audiences hadn't seen in a long time - the Red Skull. After being shot into space in Captain America: The First Avenger, the Red Skull became a guide for those who sought out the Soul Stone. It was his duty to reveal the price they had to pay in order to obtain it: a soul for a soul.
Fans have known for some time now that Gamora was once the daughter of Thanos (though not by birth). She was taken as a young girl and raised by the Mad Titan, but she eventually found herself in a particular circumstance that allowed her to become a founding member of the Guardians of the Galaxy. However, her past was relatively unknown (in the MCU, that is) until Avengers: Infinity War released.
In Avengers 3, a flashback sequence shows Thanos and what appears to be the Chitauri visiting Gamora's homeworld and slaughtering half its population. Although the planet isn't given a name in the movie or described in any way, Gamora's birthplace in the comics is Zen-Whoberi, which we can assume is the same for the MCU.
Thanos isn't called the Mad Titan for no reason; it's actually the name of the planet that he's from. While Titan's location in the MCU remains unclear, in the comics, Titan is still the real-life moon of Saturn. Regardless of its location, though, Titan suffered a catastrophic event that practically wiped out all life on the planet, except for Thanos. He had suggested half of the planet's population be exterminated so as to prevent mass extinction, but his methods were rejected and that's how earned his name as the Mad Titan.
In Avengers: Infinity War, Iron Man, Spider-Man, and Doctor Strange arrive on Titan via Ebony Maw's spaceship. That's where they first meet Star-Lord, Mantis, and Drax, who came to kill Thanos. Together, they all attempt to kill the Mad Titan on the planet, along with the help of Nebula, before their expertly crafted plan goes awry and Thanos manages to defeat them all. Or, perhaps, that was all part of the plan (read: Doctor Strange's endgame plan)?
The Asgardians are responsible for safeguarding the Nine Realms, which includes the Dwarven home, Nidavellir. It's there that the universe's most powerful items are crafted, including Thor's Mjolnir and Thanos' Infinity Gauntlet, since the Dwarves are known for being blacksmiths in this universe (and pretty much every fantasy universe).
After being saved by the Guardians, Thor embarks on a journey to Nidavellir with Groot and Rocket Raccoon so that Thor could obtain a weapon powerful enough to kill Thanos: Stormbreaker. When Thor and his companions arrive at Nidavellir, they find the place deserted, frozen, and above all, lifeless. That's because Thanos and his Black Order killed everyone except King Eitri (Peter Dinklage), who ends up helping Thor forge Stormbreaker.
- Avengers: Infinity War / The Avengers 3 (2018) release date: Apr 27, 2018
- The Avengers 4 / Avengers: Endgame (2019) release date: Apr 26, 2019
- Spider-Man: Far From Home (2019) release date: Jul 02, 2019
- Ant-Man & The Wasp (2018) release date: Jul 06, 2018
- Captain Marvel (2019) release date: Mar 08, 2019