Marvel is building up to “Doomsday,” which hits theaters exactly one year from Thursday, with this Cap-focused teaser attached to screenings of “Avatar: Fire and Ash.” There will reportedly be more teasers that focus on other characters in the coming weeks.

After Steve went missing and was frozen in the ice in the original “Captain America” movie, Peggy grew old but never stopped loving him. Now with the Quantum Realm time-traveling technology, the two were able to get married and live out their lives together through the decades.

Does this teaser mean that Steve somehow returns to the main MCU timeline to rejoin the Avengers? Is this the same Cap, or is he a variant of the elderly hero from the finale of “Endgame”? And who’s the baby. Does he or she have super-soldier powers like Cap?

Evans isn’t the only original “Avengers” star who will be back for “Doomsday.” Robert Downey Jr. is returning, but not as Tony Stark. Instead, he is replacing his Iron Man armor to play the ultimate villain, Doctor Doom, in the multiverse-crossing movie. Other returning heroes include Chris Hemsworth as Thor, Mackie, Danny Ramirez, Sebastian Stan, Paul Rudd, Tom Hiddleston, Letitia Wright, Winston Duke, Simu Liu, Pedro Pascal, Vanessa Kirby, Joseph Quinn, Ebon Moss-Bachrach, Florence Pugh, David Harbour, Wyatt Russell, Hannah John-Kamen and Lewis Pullman. From the “X-Men” universe, Patrick Stewart, Ian McKellen, Kelsey Grammer, Alan Cumming, James Marsden, Channing Tatum and Rebecca Romijn will cross over into the MCU.