Mark Ruffalo Promises 'Cooler' Sequel of 'Avengers'

Mark Ruffalo offered "Avengers" fans a hint at what the upcoming sequel film will include when it hits theaters next year.

(Photo: Reuters/Andrew Kelly)Actor Mark Ruffalo arrives at the screening of the film "Marvel's The Avengers" for the closing night of the 2012 Tribeca Film Festival in New York April 28, 2012.

"Avengers: Age of Ultron" is expected in theaters during summer 2015, and Ruffalo promised it will be "cooler."

"I would say that it's better, it's cooler, it's more awesomer," the actor said while at the Sundance Film Festival on Monday, according to MTV. "It's a little bit darker, but also really has Joss Whedon's incredible witty and sly sense of humor."

Ruffalo portrays the Hulk in the "Avengers" films, which also stars Robert Downey Jr., Chris Evans, Chris Hemsworth, Jeremy Renner and Scarlett Johansson, among many others.

The Hulk "gets to do such great stuff," said Ruffalo of his character, also known as Bruce Banner.

Meanwhile, the Whedon-directed film "Avengers" grossed $1.51 billion worldwide after its release in 2012, and fans anxiously await its follow-up film.

In the past, Ruffalo has opened up about workin on the "Avengers" set, including complaints about filming in motion capture suits.

"Yes, and that was my first day and that was a miserable day," he said, according to The Huffington Post. "It was smoky, it was hell and I felt really uncomfortable."

As for his co-star Johansson's costume, Ruffalo said, "They spray paint her suit on in the morning, But she looks good in it."

Johansson also offered her take on what fans can expect from her character, the Black Widow, in the sequel film.

"Oh boy! Well, we can expect the Avengers," the actress said, according to Parade magazine. "Joss [Whedon], again, is back, wrote the script, and is directing."

Furthermore, the starlet said the "Avengers 2" script is "dark, it's got this amazing one-liner, glass-cutting sense of humor."

"People can expect gravity this time around," she added.