"Avengers: Doomsday," which got its first full trailer on Monday, will reunite the beloved Marvel superhero team for their first movie adventure since 2019. It will also introduce one of the most iconic comic book villains of all time to the Marvel Cinematic Universe.Here's what you need to know about the movie.Is there a trailer?Yes, Marvel released the first full trailer on Monday.When will 'Avengers: Doomsday' be released?The movie will hit theaters Friday, Dec. 18, 2026.Scene from Marvel's "Avengers: Doomsday."MarvelWhat is the movie about?The official synopsis gives us a hint about what to expect."Beloved heroes from three distinct universes will be set on a deadly collision course and face an existential threat unlike anything they've ever encountered," it reads.Marvel Studios revealed who several of these heroes are in a series of teaser trailers late last year, showcasing Chris Evans returning as Steve Rogers (the original Captain America), Chris Hemsworth as Thor, the X-Men, the Wakandans and the Fantastic Four.Scene from Marvel's "Avengers: Doomsday."MarvelWho else is in 'Avengers: Doomsday'?The movie has assembled an absolutely stacked cast, which was revealed in a 2025 livestream:Vanessa Kirby as Sue Storm/Invisible WomanAnthony Mackie as Sam Wilson/Captain AmericaSebastian Stan as Bucky Barnes/Winter SoldierLetitia Wright as Shuri/Black PantherPaul Rudd as Scott Lang/Ant-ManWyatt Russell as John Walker/U.S. AgentTenoch Huerta Mejia as NamorEbon Moss-Bachrach as Ben Grimm/The ThingSimu Liu as Shang-ChiFlorence Pugh as Yelena BelovaKelsey Grammer as Hank McCoy/BeastLewis Pullman as Bob Reynolds/SentryDanny Ramirez as Joaquin Torres/FalconJoseph Quinn as Johnny Storm/Human TorchDavid Harbour as Alexei Shostakov/Red GuardianWinston Duke as M'BakuHannah John-Kamen as Ava Starr/GhostTom Hiddleston as LokiPatrick Stewart as Charles Xavier/Professor XIan McKellen as Erik Lehnsherr/MagnetoAlan Cumming as Kurt Wagner/NightcrawlerRebecca Romijn as Raven Darkhölme/MystiqueJames Marsden as Scott Summers/CyclopsChanning Tatum as Remy LeBeau/GambitPedro Pascal as Reed Richards/Mister FantasticRobert Downey Jr. as Victor von Doom/Doctor DoomScene from Marvel's "Avengers: Doomsday."MarvelHow does this fit in the wider MCU?"Avengers: Doomsday" will be the 39th MCU movie overall and is set in the same continuity as many of the Disney+ shows. Popular ReadsHowever, newcomers shouldn't feel intimidated. It takes inspiration from the comics, but you can just jump in and enjoy this movie's story in isolation.If you want to watch a select few movies to prepare, "Avengers: Infinity War," "Avengers: Endgame," "Thunderbolts" and "Fantastic Four: First Steps" would be good options.Scene from Marvel's "Avengers: Doomsday."MarvelThese are all streaming on Disney+, along with the rest of the MCU movies and shows.The upcoming "Spider-Man: Brand New Day" may also lead into "Avengers: Doomsday" in some way -- it's the 38th MCU movie and hits theaters Friday, July 31."Avengers: Doomsday" will also set up the events of the next MCU movie, "Avengers: Secret Wars." The latter is scheduled for release on Dec. 17, 2027.Who directed 'Avengers: Doomsday'?The film is being helmed by brothers Anthony and Joe Russo, who previously directed "Captain America: The Winter Soldier," "Captain America: Civil War," "Avengers: Infinity War" and "Avengers: Endgame."Wasn't Robert Downey Jr. already in Marvel movies?Yes, he played Tony Stark/Iron Man from 2008's "Iron Man" to 2019's "Avengers: Endgame." Scene from Marvel's "Avengers: Doomsday."MarvelHowever, the Oscar-winning actor is taking on a different role in "Avengers: Doomsday." Victor von Doom/Doctor Doom is among the most beloved supervillains in popular culture, having debuted in the fifth issue of the "Fantastic Four" comic series in 1962.The MCU version of the character remains a mystery, having only appeared briefly in "Fantastic Four: First Steps."When do 'Avengers: Doomsday' tickets go on sale?Ticket sales kicked off Monday, July 20, for Infinity Vision certified theaters.Infinity Vision is a new premium format that Disney says guarantees audiences "an exceptional film presentation with big screens, bright images and outstanding sound."Can we expect more details or footage any time soon?It's possible we'll get additional information or footage during the Marvel Studios Hall H Presentation at San Diego Comic Con on Saturday, July 25. That's happening from 5:30-6:30 p.m. PT.Marvel and Disney+ are owned by Disney, the parent company of ABC News and "Good Morning America."