Doctor Doom Reportedly Discovers the “Library of the Worlds” in Avengers: Doomsday

Note: This post contains potential spoilers for Marvel’s Avengers: Doomsday.

A new leaked report from Marvel’s Avengers: Doomsday reveals that Robert Downey Jr.‘s Doctor Doom reportedly gains access to the “Library of the Worlds.”

According to insider Majestic, the Library is described as a forbidden multiversal archive hidden from everyone — including the TVA. Current rumors suggest that the “Library of the Worlds” may be a plane of existence created either by the Beyonder or by He Who Remains.

The Library contains maps, records, and blueprints of every Incursion ever recorded, along with data on future Incursions that haven’t occurred yet, giving Doom an immeasurable strategic advantage.

In Doomsday, Doom’s access to the Library could explain how he becomes one of the most dangerous multiversal threats ever seen. The TVA reportedly kept the Library’s existence secret due to its catastrophic potential.

We previously reported that Doom may completely destroy the TVA in Avengers: Doomsday. At another point in time and space, a massive battle erupts at the TVA, where Doctor Doom faces the Multiversal Avengers assembled by Loki. The team consists of Captain America, Ghost Rider, Spider-Man (Tobey Maguire), Blade, Elektra, Gambit, Wolverine, Deadpool, X-23, Captain Carter, Thor, along with variants of Captain America and Thor, and the Superior Iron Man wielding the Infinity Stones. The fight takes place in the Void, as the heroes face off against an army of Doombots and Doctor Doom himself in an epic and devastating clash. Despite their combined strength, Doom defeats the Multiversal Avengers, leaving only Thor, Loki, and Captain America (Steve Rogers) standing. The trio fights to protect Loki but are ultimately overpowered. In the end, Doom takes Loki’s powers, along with those of Wanda and the Sentry.

Directed by the Russo brothers from a screenplay by their longtime collaborator Stephen McFeely and Michael Waldron. The film features cinematography by Newton Thomas Sigel (Bohemian Rhapsody, X-Men: Days of Future Past) and production design by Kasra Farahani.

Here’s the plot synopsis for Avengers: Doomsday, revealed by Disney China:

“Doctor Doom has officially arrived on the Marvel Cinematic Universe stage. This villain, a master of cutting-edge science and powerful magic, will unleash a cascading crisis across the multiverse. Marvel’s most iconic actor, Robert Downey Jr., also returns as Doctor Doom!”

As of now, the announced cast members of Avengers: Doomsday are: Downey Jr. as Doctor Doom, Paul Rudd as Ant-Man, Simu Liu as Shang-Chi, Tom Hiddleston as Loki, Florence Pugh as Yelena Belova, Danny Ramirez as Falcon, Sebastian Stan as Bucky Barnes, Winston Duke as M’Baku, Hemsworth as Thor, Letitia Wright as Black Panther, Tenoch Huerta Mejía as Namor, Anthony Mackie as Captain America, David Harbour as Red Guardian, Wyatt Russell as U.S. Agent, and Hannah John-Kamen as Ghost. Ian McKellen as Magneto, Patrick Stewart as Professor X, Rebecca Romijn as Mystique, James Marsden as Cyclops, Kelsey Grammer as Beast, Alan Cumming as Nightcrawler, and Channing Tatum as Gambit. Pascal as Reed Richards (Mr. Fantastic), Vanessa Kirby as Sue Storm (Invisible Woman), Joseph Quinn as Johnny Storm (Human Torch), Ebon Moss-Bachrach as Ben Grimm (The Thing), and Lewis Pullman as Sentry.

Produced by Kevin Feige, Louis D’Esposito, and Russo Brothers will produce through their AGBO banner.

Avengers: Doomsday will be released in theaters and IMAX across the United States on December 18, 2026, and Avengers: Secret Wars is scheduled for release on December 17, 2027.