Chris Evans and Robert Downey Jr will put their characters' differences aside as they lead their Captain America: Civil War co-stars down the red carpet on Tuesday night.
Chris, who plays Steve Rogers (Captain America), and Robert, who plays Tony Stark (Iron Man), are to attend the film's European premiere at Westfield in London, alongside fellow Avengers Sebastian Stan, Anthony Mackie, Jeremy Renner, Paul Bettany, Elizabeth Olsen, Paul Rudd, Emily Vancamp, Tom Holland, Daniel Bruhl and Martin Freeman.
The film sees the Avengers split into two opposing camps, with Captain America and Iron Man facing off over their future as an autonomous team of superheroes.
After a disastrous incident in which Scarlet Witch (Elizabeth) causes collateral damage and the death of innocent civilians, the Avengers are told to submit to government oversight and a system of accountability.
This divisive move fractures the team of superheroes. Captain America rebels against government interference, joined by the Winter Soldier (Sebastian), Falcon (Anthony), Hawkeye (Jeremy) and Scarlet Witch.
But ranged against him are Iron Man, War Machine (Don Cheadle), Black Widow (Scarlett Johansson), Black Panther (Chadwick Boseman) and Vision (Paul).
Despite the characters' fierce on-screen rivalries, they will unite on the red carpet, where they will be joined by directors Anthony and Joe Russo.
The Marvel blockbuster is also set to draw a crowd of celebrities, including musician Jamie XX, football manager Jose Mourinho, actor Mark Strong, Maze Runner actress Kaya Scodelario, singer Conor Maynard, Game of Thrones actor Jack Gleeson, and members of the band McFly.
Captain America: Civil War is due to be released at UK cinemas on April 29.