Anthony Mackie, Hayley Atwell, and Idris Elba have been confirmed as appearing in Avengers: Age of Ultron.

The confirmation comes from the new Avengers: Age of Ultron poster released on Tuesday. While not top-billed, the three actors’ names were including in the cast list as the bottom of the poster.

Mackie, who plays the Falcon, has been rumored to appear at the end of the film as part of a new team of Avengers led by Captain America, leading into Captain America: Civil War. It seems unlike Marvel to spoil that big reveal so early, so it’s possible that this means the Falcon will appear during the main story of the film, if only briefly. He and Captain America were going to try to find Bucky Barnes at the end of Captain America: The Winter Soldier, so, if nothing else, perhaps Falcon will give Cap and update on that front while Captain America is busy keeping the world safe in S.H.I.E.L.D.’s absence.

Atwell was previously confirmed as reprising her role as Agent Peggy Carter for a flashback scene in Ant-Man, but her addition to Avengers: Age of Ultron was previously unknown. Whether she will appear in a flashback scene, or if this confirms certain fan theories about time travel in Avengers: Age of Ultron, remains to be seen.

Idris Elba had previously let slip that he would be playing Heimdall in Avengers: Age of Ultron, much to director Joss Whedon’s chagrin, but what role the sentry of the Bifrost will play in the film is still unknown.

Avengers: Age of Ultron opens May 1.