A lot of actors have taken on the role of the incredible Hulk, whose alter ego is the smart and unassuming Dr. Bruce Banner, but none of those films have really resonated well with audiences, that is, until Mark Ruffalo came along and portrayed him in the original Avengers film.

Since then, fans have been wondering when Marvel Cinematic Studios will decide to create a standalone film for the ruthless green monster slash superhero, just like his fellow Avengers members Iron Man (Robert Downey Jr.) and Captain America (Chris Evans).

This is what Ruffalo discussed in an interview with Collider. Ruffalo remains optimistic that his character Hulk will be given the spotlight at some point in time, but he reasoned that there won't be any solo movies right now since Marvel does not really have any rights to a Hulk standalone movie.

"That's still Universal's property, so there's that issue," he explained. "That's a big impediment to moving forward with that. Now I don't think that's insurmountable, by the way, but I don't know where it's going from here for me."

When asked how many movies he has lined up as the Hulk, the actor seemed even more optimistic about the character's future and said that a lot of doors can actually open for Banner, depending on the situation.

"I think it's four now, but that could always go further. That could include different-I could show up in another character's movie; I could do Avengers 3 and 4; I could do a Hulk standalone; I could do a combination of those things. That's four or five, I think," he said.

Meanwhile, a lot of superheroes have already confirmed appearances in Captain America: Civil War, such as Iron Man, Hawkeye (Jeremy Renner), and Black Widow (Scarlett Johanssen), so fans have been calling it "Avengers 2.5." And while everybody seems to be all set to make a cameo, the Hulk's appearance has not been guaranteed.

"I don't know if I'm in it yet. I don't know. Sometimes these things happen at the last minute in this world. I really don't know where I fit in from here on out, and I'm not sure they do," Ruffalo admitted.

There have actually been rumors that the Hulk will be killed off in the upcoming Avengers: Age of Ultron film, or if not, then either on Avengers: Infinity War Part 1 or 2. But the way Ruffalo is talking, it seems like his character won't be saying goodbye to fans just yet.