Anthony Mackie is ready for battle after stepping into the role of Captain America in Avengers: Doomsday, and this time, he’s taking on none other than Robert Downey Jr.

The actor, who officially debuted as the shield-wielding superhero in Captain America: Brave New World, revealed that filming for the highly anticipated Avengers installment is set to begin in March or April. Downey Jr., known for his portrayal of Tony Stark/Iron Man, is returning to the Marvel Cinematic Universe with a dramatic twist—as the infamous Doctor Doom. Anthony Mackie shared his excitement about the cinematic showdown in an interview with Deadline, saying he’s thrilled to face off against the Hollywood icon in an entirely new dynamic.

Mackie previously teamed up with Downey Jr. when their characters fought alongside each other in previous MCU films. This time, however, the two will be on opposite sides, adding another layer of intensity to the story. While Avengers: Doomsday remains shrouded in secrecy, its production schedule is set. Mackie confirmed that filming will take place in London this summer, with Avengers: Secret Wars following a year later. However, when it comes to which Avengers veterans might return, he insisted he’s just as in the dark as everyone else.