The 49-year-old actor has starred as Bruce Banner/The Hulk in the Marvel Cinematic Universe since "The Avengers" and is reprising his role in the third "Thor" movie alongside Chris Hemsworth as the titular character.
"Thor: Ragnarok" marks the first time the MCU will feature a lead female villain, Hela - played by Cate Blanchett and the film also features another strong-female Valkyrie (Tessa Thompson) and Ruffalo has nothing but praise for his co-stars.
He said: "It's great that we have Blanchett and Thompson, these two awesome, powerful, strong, beautiful, intelligent women, playing these two important, integral characters in this movie". She has all the power, all the strength, all the talent of any of the other gods, but with all the rage. Except that she's been pushed so far into the darkness that she's become dark. Then you have Valkyrie, played by Thompson. She's a powerhouse and a brilliant fighter. She's as equally as powerful as Thor. But she's also lost faith in the patriarchy and the elite power structure. We recently learned that the short, directed by Thor: Ragnarok's Taika Waititi, isn't canon; it's likely merely a coincidence that the thunder god's quest for Thanos was mentioned.
"What he realized really fast- I don't think I'm giving too much away because it's right at the top of the film", Winderbaum continued, "but basically that one quest, that universe-ending peril that he was trying to figure out dovetailed or branched off into any number of universe-ending perils that he's been adventuring on for the two years leading up to the beginning of this film".
Now that Thor: Ragnarok has been named as the most-anticipated release of the fall season - ahead of Justice League, no less - it's fair to say that excitement for Marvel and Taika Waititi's galactic epic is beginning to reach a fever-pitch.
Executive producer Brad Winderbaum revealed what Thor has been doing after the events of "Avengers: Age of Ultron" and how he ends up in Sakaar and in a conflict with Hela and Surtur.