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It focuses on supervillain Victor von Doom/Doctor Doom, played by Downey.

According to Marvel, \"Avengers: Doomsday\" tells the story of heroes from three universes who are, \"set on a deadly collision course and face an existential threat unlike anything they’ve ever encountered.\"

In addition to Downey Jr., Evans and Atwell, the film also stars Chris Hemsworth, Pedro Pascal, Paul Rudd, Anthony Mackie, Florence Pugh, Vanessa Kirby, Ebon Moss-Bachrach, Wyatt Russell, Channing Tatum, Ian McKellen, Patrick Stewart, Joseph Quinn, Sebastian Stan, Kathryn Newton, Alan Cumming, Tom Hiddleston and more.

\"Robert
Courtesy Of Marvel/Marvel
Robert Downey Jr. as Victor von Doom / Doctor Doom in Avengers: Doomsday.
>

\"Avengers: Doomsday\" hits theaters on Dec. 18, and tickets are on sale now.

D23: The Ultimate Disney Fan Event is the company's biennial exposition, where it previews upcoming movies, shows, experiences and products, in addition to honoring its history.

\"PHOTO:
Marvel
PHOTO: (L-R) Letitia Wright, Winston Duke, Ebon Moss-Bachrach, Vanessa Kirby, Sebastian Stan, Danny Ramirez and Hannah John-Kamen in Marvel's "Avengers: Doomsday."
>

This year's event is taking place at the Anaheim Convention Center from Friday to Sunday.

The Walt Disney Co. is the parent company of Marvel Entertainment and ABC News.

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