Hulk is greeting guests throughout the day in Avengers Campus at Disney California Adventure. These appearances are for a limited time, but Disney has not shared what that means. They started earlier this week. Throughout the day he walks out from gate/door used for the Red Cars in the Avengers HQ building. He is in a roped off area and poses for pictures and talks to the crowd. Here are some pictures & a video clip of the Hulk with Black Widow.