Sebastian Stan hasn't seen Doomsday but is guessing it's sad

Avengers: Doomsday star Sebastian Stan hasn’t watched the highly anticipated movie—but even if he did, would he tell anyone? “I haven’t seen the movie, and I don’t know how it turned out,” Stan told Decider in a new interview. “I’m sure it’s going to be probably heartbreaking, in a lot of ways. We’ll see who makes it to the next level.” Doomsday , in theaters on December 18, follows superheroes from three universes teaming up…