The Hulk is set to star in 'Captain America: Civil War'.

The iconic Marvel character, played by Mark Ruffalo, will feature alongside the likes of Ant-Man and Spider-Man in the eagerly awaited comic book movie, after he was seen on the film's set.

The 47-year-old actor's on-set appearance has ended months of speculation as to whether he would reprise the role following his star turn in 'Avengers: Age of Ultron'.

Earlier this year, Mark claimed he would feature in the movie - but was only basing that on what he'd heard from his 'Avengers' co-star Robert Downey Jr.

He shared: ''If Robert Downey, Jr. says I'm in 'Captain America', I'm in 'Captain America' dammit. And I will wait for the day that my call sheet shows up at my doorstep or my script.

''At this point, I'm told that I'm in it by Robert, which I'll take as biblical, but I just haven't heard or seen from production yet.''

Meanwhile, 'Captain America' star Chris Evans claimed the new film will see the superhero develop a serious love interest.

Chris said: ''I think we really scratched the surface on something great and I think there's just so much to explore.

''Not just with the evolution of myself and [Anthony Mackie's character, Falcon], but the reconnection with Bucky, and ultimately a relationship with a woman.''