Avengers 4 has been directed by Anthony and Joe Russo.

The Russo Brothers have revealed that the forthcoming Avengers 4 will be the longest film in the Marvel Cinematic Universe. In an interview with Collider, the director duo said that the untitled sequel may be longer than its predecessor Avengers: Infinity War, which had a run time of 149 minutes.

"I'll say it could easily be a three hour film, but I think that, you know, we're very hard on the material. We like it to play at a certain pace. I'm sure that we'll squeeze it. ," said Joe Russo. The directors also refused to reveal the title of the film.

The makers have gone the extra mile to keep spoilers at bay by writing fake scenes and having dummy scripts instead of the real ones. Karen Gillan, who plays Nebula, revealed in a podcast Shoot This Now that she was never handed a script, but just got her scenes. Gillan said that the directors would fill the actors in on everything there was to know in terms of context, but she still did not know what exactly the plot of the film was.

Paul Bettany, who plays Vision in the film, had also shared with HeyUGuys how secretive the makers were and incorporated fake twists and turns in the scripts that were never shot.

In an appearance on Jimmy Kimmel Live, Robert Downey Jr had even confessed to being part of the fake script writing process.

Avengers 4 stars Downey Jr, Josh Brolin, Mark Ruffalo, Tom Hiddleston, Chris Evans, Chris Hemsworth, Jeremy Renner, Chris Pratt, Elizabeth Olsen, Sebastian Stan, Benedict Cumberbatch, Bettany, Samuel L Jackson, Cobie Smulders, Benedict Wong, Zoe Saldana, Karen Gillan, Katherine Langford, Vin Diesel, Dave Bautista, Pom Klementieff, Scarlett Johansson, Tom Holland, and Anthony Mackie.

The Marvel film will open in theatres worldwide on 3 May, 2019.