Luckily for them, there is an ingenious system in place to help them — a set of baseball cards. The Russo brothers, who are directing both Doomsday and the follow-up Avengers: Secret Wars, have recently talked about this inventive way of working out which actors are available.

With several projects on the slate for this year, most of the interest lies in 2026's Avengers: Doomsday. The upcoming fourth Avengers installment will bring together a series of beloved superheroes,