Back when we go our first leaked pictures from the set of Captain America: Civil War, Mark Ruffalo teased the appearance of Bruce Banner and Hulk in the movie. Apparently, Robert Downey Jr. pulled some strings for his good friend and made it all happen.
And Hulk would have been quite a good addition to the movie, although he would have tipped the balance in the favor of any of the teams he may have ended in. Of course, this would have been a change from the comic book source, but nobody would have minded that "“ the Green Goliath has become a fan favorite since Mark Ruffalo appeared in the first Avengers film.
However, new information has appeared.
Mark Ruffalo, about Hulk and Civil War

During an interview at the Venice Film Festival, Mark Ruffalo said that his talk with Robert Downey Jr. about Hulk and the Civil War wasn't just a rouse. The character was actually in the script at that moment.
Past tense, right? Because there is no more Hulk in the Civil War adaptation, just like in the original source. So what happened? Why did they take him out of the movie, when there were even leaks with the actor appearing on the set?
According to the actor, the powers that be changed their mind: "Because it's still missing is not known where. I thought that I would be in the film, but in the end evidently believe that reveal what happened Hulk is something too big, and Marvel wants to use this information later. My character had been inserted in the script, but then it was taken away. Who knows, maybe Hulk will never return. However, they want to keep the revelation of what happened a secret, because it is something really big." (via Screen Rant)
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