Mark Ruffalo Says the Hulk was Removed from… by filmjunkee
We get our answer whether or not the Hulk is in Captain America Civil War from the man himself. Mark Ruffalo chimed in to BadTaste.it about his role in Civil War, and mentions that the original plan was to have him in the anticipated sequel, but sadly has now been removed. No Hulk vs. Red Hulk gang.
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.
Source: Screenrant