One of the biggest complaints fans had with the first trailer for Marvel's Guardians of the Galaxy earlier this week is that we never hear Rocket Raccoon, voiced by Bradley Cooper, speak. Today, we can finally hear what this rambunctious raccoon sounds like in a brief behind-the-scenes featurette, which includes new footage and interviews with Bradley Cooper and director James Gunn. Watch, then read on for more details about who will be showing up in the second trailer.

In a separate interview with Pointless Podcast, director James Gunn revealed which characters will be introduced in the second trailer, and explained exactly who performed the motion-capture for Rocket Raccoon.

According to the director, another trailer has already been cut together, which features the introductions of Ronan (Lee Pace), Nova Prime (Glenn Close) and Yondu (Michael Rooker), who was only briefly seen in the first trailer.

"I'm saving some people for the second trailer, which I like better than the first trailer, frankly. The main people we're saving are Ronan, played by Lee Pace, Yondu... that is Yondu there holding Drax (in the first trailer), played by Michael Rooker and Nova Prime, played by Glenn Close."

Some fans have also wondered whether or not this Marvel Phase Two adventure will feature the Skrulls, an alien race of shapeshifters who were once rumored to appear in Marvel's The Avengers. James Gunn set the record straight, revealing that Marvel doesn't actually own the full movie rights for the Skrulls.

"Marvel only partially owns Skrulls, and also for the record, we don't own the Badoon either. So people were asking why we have the Sakaaran in the film, we don't own the Badoon."

Bradley Cooper signed on to voice Rocket Raccoon back in August, after production had already wrapped. James Gunn said that his brother Sean Gunn actually performed in a motion-capture suit as Rocket while production was under way.

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"My brother Sean Gunn wore a little green suit and he waddled around and he acted out Rocket. I think all of the guys will attest to the fact, and they have in all their interviews, that he was a great part of the team, and it really was Zoe (Saldana), Dave (Bautista), Chris (Pratt), and Sean who sort of like created the energy that people will see in the movie between these four characters, who are usually at odds and sometimes find common ground. Sean was a big part of that energy and creating that, not only was a he doing a great job performing himself, but also gave the other actors something to work off of so they're not working with a tennis ball."

You can take a look at the full six-minute interview with director James Gunn below.