There's no denying it: Avengers: Infinity War will feature the largest cast for a Marvel movie yet. Building off everything that's happened in the Marvel Cinematic Universe since it launched in 2008, the movie will see the Avengers, Guardians of the Galaxy and more to fight the threat this franchise has been teasing for half a decade: Thanos. He's one of the greatest villains in the Marvel comics, and he'll finally prove why he's so formidable on the silver screen.
There's still a lot that hasn't been revealed yet about Avengers: Infinity War, including how it connects to 2019's Avengers 4. Fortunately, one area where there's plenty of information is castings. While Marvel is remaining tight-lipped on the new characters who will appear (including who Peter Dinklage and Terry Notary are playing), there have been numerous confirmations about characters who will be returning. Let's take a look at all the MCU heroes and villains who will definitely be back for Avengers: Infinity War.
Thanos stayed on the sidelines for five years now, but in 2018, he'll finally prove why he's the overarching antagonist of the MCU. After several of his minions failed to retrieve the Infinity Stones on his behalf, the Mad Titan decided at the end of Avengers: Age of Ultron to take his Infinity Gauntlet out of the vault and secure them himself. If he succeeds, Thanos will be able rewrite all of reality, and like his comic book counterpart, he may be doing this to court Death.
Iron Man has been part of the MCU since the beginning, so it would be weird if he didn't participate in Avengers: Infinity War. Tony Stark has been through a lot over nearly a decade, from becoming a superhero and walking away from war profiteering to working with the government on registering enhanced individuals. Tony is still continuing his Iron Man duties and trying to keep the world safe, so bet on him being at the front lines and breaking out his best tech yet to fight Thanos.
Captain America has been one of the MCU's most cherished heroes for decades, but as of Captain America: Civil War, Steve Rogers has abandoned his patriotic mantle and is on the run due to his anti-registration activities. Despite his current predicament, Steve is still someone who will do the right thing no matter what. So when Thanos comes to Earth, he'll jump back into action to keep the innocent safe, which hopefully means picking up his vibranium shield again.
Even though he hasn't been involved with the Avengers for a while, Thor's been keeping himself busy. Along with departing Earth at the end of Avengers: Age of Ultron to learn about the Infinity Stones, he also has to deal with what's coming up in Thor: Ragnarok, which includes finding Odin, surviving Sakaar and preventing Hela from destroying all of Asgardian civilization. The God of Thunder will be put through the ringer this fall, but rest assured, he'll be ready for battle during Avengers: Infinity War.