The Thor: Ragnarok premiere wasn’t the first time Mark Ruffalo accidentally spoiled a major Marvel Studios release, as it looks like he completely spoiled Avengers: Infinity War at the D23 Expo last summer.
At that convention, Marvel Studios revealed the first Infinity War footage (prior to repeating it at SDCC a week later). As part of the press promotion for the event, Good Morning America interviewed Don Cheadle and Mark Ruffalo about the movie, and he actually starting things off pretty tame saying about Ragnarok, “It doesn’t end well for the superheroes.” That didn’t seem to be enough, so then he dropped this bomb, “Wait until you see the next one, everybody dies!”
The video is worth it both for Don Cheadle’s reaction, and the slow realization that comes over Mark Ruffalo when he realizes he just spoiled the ending to Infinity War:
— Good Morning America (@GMA) July 16, 2017