'Guardians Of The Galaxy' Almost Cast WHO As Thanos?

Director James Gunn is joking... probably.

Even though his role in "Guardians of the Galaxy" doesn't amount to much more than a cameo, Thanos is bound to have a huge impact on the larger Marvel Cinematic Universe. That's why James Gunn and Marvel Studios needed to carefully weigh their options when casting the Mad Titan.

So how did they end up casting Josh Brolin? More importantly, how did he beat his competition, Pauly Shore and Paul Reubens?

The process, as Gunn told us, began with considering who could handle the enormity of a villain as powerful as Thanos.

"Josh was just somebody who came up when we were trying to think of who could play Thanos. Josh was somebody who came up," Gunn said. "I'm a big fan of his work, and he was somebody who came up who really had the weight that you need for somebody like Thanos."

But Brolin wasn't the only contender. "We talked about Pauly Shore for a long time. It didn't seem to be great. He wanted too much money. We talked a lot to Paul Reubens. He didn't seem to be Thanos," Gunn said. "Then we came to Josh Brolin. 'I think he seems to fit more than those other two guys.' "

Unfortunately, now that this information is out there, it will be impossible to watch "Guardians of the Galaxy" without wanting to see the Weasel or Pee-wee Herman as Thanos.

"Guardians of the Galaxy" opens in theaters on August 1.