Based on the information being released on the plot of upcoming blockbuster, "Avengers: Age of Ultron," it is the public's understanding that Iron Man created Ultron, the villain the soon-to-be-released film.
However, according to Mark Ruffalo, who plays The Hulk/ Bruce Banner, he explains that Banner and Tony Stark have been working together.
During a recent interview with Total Film via Cinema Blend, Ruffalo spoke about living arrangements and working environment of his character.
"Banner's been living in Stark Tower," revealed the "Begin Again" actor. They've been working side by side and Bruce has his own lab now. He's doing work that augments Tony's own, which could lead to an experiment going wrong..."
The official film synopsis revealed by Marvel describes the film as "the epic follow-up to the biggest Super Hero movie of all time. When Tony Stark tries to jumpstart a dormant peacekeeping program, things go awry and Earth's Mightiest Heroes, including Iron Man, Captain America, Thor, The Incredible Hulk, Black Widow and Hawkeye, are put to the ultimate test as the fate of the planet hangs in the balance. As the villainous Ultron emerges, it is up to the Avengers to stop him from enacting his terrible plans, and soon uneasy alliances and unexpected action pave the way for an epic and unique global adventure."
Given the scenario described by Ruffalo, one can assume that Bruce Banner has a hand in the creation of Ultron. Latino-Review further analyzed that Banner could feel guilt "that can unfold into the epic battle between the Hulk and the Hulkbuster."
Additionally, Ruffalo also discussed his relationship with the Black Widow/ Natasha Romanoff (Scarlett Johansson) due to their similarities. "His relationship with Natasha deepens. There's something similar about the two of them. I see them as lost souls. They're kindred in some ways."
The Avengers sequel hits theaters on May 1, 2015.
Catch the returning cast that includes Robert Downey Jr., as Iron Man, Chris Evans as Captain America, Chris Hemsworth as Thor and Mark Ruffalo as The Hulk. They will be joined by Scarlett Johansson as Black Widow, Jeremy Renner as Hawkeye, and Samuel L. Jackson as Nick Fury.
The team of superheroes will square off against James Spader, playing the role of Ultron, an artificial intelligence determined to end the human race.
See the trailer of "Avengers: Age of Ultron" below: