Ant-Man sat out the universe-altering Avengers: Infinity War but in Avengers 4, the diminutive superhero may ultimately be the cause of Thanos' defeat. Infinity War ended with Thanos achieving his lifelong goal of wiping out half of all life in the universe. Though he also paid a heavy price - the Avengers killed the Children of Thanos and he sacrificed Gamora to earn the Soul Stone - the Great Titan still possesses the completed Infinity Gauntlet, which essentially makes him the god of the Marvel Cinematic Universe. Meanwhile, most of the Avengers are dead and the universe lies in ruins. Right now, Thanos looks unbeatable.
However, the Avengers have some overlooked positives still in their favor, and one of them is Ant-Man. We know Scott Lang will be part of Avengers 4, though it's uncertain who else from his cast of characters didn't fade to dust from Thanos' finger snap (the two actresses who play mother and daughter versions of the Wasp, Michelle Pfeiffer and Evangeline Lilly, are expected to appear in some fashion in Avengers 4). In any case, Ant-Man is a player in the next big Marvel team-up film, and the littlest Avenger might just be one of their heaviest hitters.
After Ant-Man and the Wasp, which is a prequel to Avengers: Infinity War that explains Scott's misadventures following his role in Captain America: Civil War, the shrinking superhero finds himself one of the few superheroes left the Avengers can call upon to bolster their ranks for a rematch with the Mad Titan. Indeed, without Doctor Strange and his mastery of the mystic arts, Ant-Man brings something invaluable to the table that Earth's Mightiest Heroes could use to fight and beat Thanos: the Quantum Realm.
For all of the Avengers' powers, they have been limited so far in that most of their abilities are physical. Doctor Strange and Ant-Man broadened the MCU by introducing supernatural and metaphysical elements; literal dimensions the more Earthbound superheroes don't have a means to access. With this in mind, here's why Ant-Man and the Quantum Realm could beat Thanos in Avengers 4.
- This Page: How Ant-Man Can Use The Quantum Realm
- Page 2: Time Travel Might Be The Only Way To Save The Other Avengers
How Ant-Man Can Use The Quantum Realm
Introduced in Ant-Man, the Quantum Realm is, as Hank Pym explained, "a reality where all concepts of time and space become irrelevant as you shrink for all eternity." The Realm is accessible by subatomic shrinking via Pym Particles, Hank's discovery that allows for Ant-Man's size manipulation, but can also be entered by magical means like a Sling Ring as Doctor Strange showed. The Quantum Realm is an unexplored dimension, but a being traveling safely through it could then reach other places, times, and dimensions within the Multiverse.
Hank's wife Janet Van Dyne, the original Wasp, has been lost in the Quantum Realm since the late 1980s; Ant-Man and the Wasp will see Scott, Hank, and Hope Van Dyne, the new Wasp, re-enter the Quantum Realm to find Janet, thereby further exploring this mysterious section of the Multiverse in the process. It's also believed Captain Marvel could be trapped in the Quantum Realm as well, which would explain her absence from the MCU for the last two decades.
In Ant-Man and the Wasp, Hank Pym seems to have perfected his technology that will allow for safe travel through the Quantum Realm via a size-changing experimental vehicle. This could end up as a crucial development for the future of the MCU; Ant-Man bringing this access to the Avengers gives them a way to counter and possibly undo the deaths Thanos caused in Avengers: Infinity War.
Thanos possesses ultimate power thanks to the Infinity Gauntlet, but he is still a being who exists in the physical universe and thinks two-dimensionally. The power of the Infinity Stones grant him higher planes of knowledge, but ultimately, he wouldn't expect Earth's superheroes, whom he has already physically overwhelmed, to also possess access to the interdimensional. The Titan is also likely overconfident following the certainty of his victory. Therefore, unless Thanos is looking for and expecting the Avengers to attack him in ways other than physical, he wouldn't see them - or Ant-Man - coming via the Quantum Realm.