Indiana Jones and the Kingdom of the Crystal Skull has earned a whopping $743.7 million in worldwide receipts. With those kind of numbers, it's no surprise that talks of a fifth Inday film have started. The Sunday Times recently spoke with George Lucas and he had some interesting things to say about the possibility of a fifth Indy flick.

"We were hoping for box-office figures like that, which is, ultimately, with inflation, what the others have done, within 10%," Lucas explains. "So, we squeaked up there. Really, though, it was a challenge getting the story together and getting everybody to agree on it. Indiana Jones only becomes complicated when you have another two people saying 'I want it this way' and 'I want it that way', whereas, when I first did Jones, I just said, 'We'll do it this way' - and that was much easier. But now I have to accommodate everybody, because they are all big, successful guys, too, so it's a little hard on a practical level.

"If I can come up with another idea that they like, we'll do another. Really, with the last one, Steven wasn't that enthusiastic. I was trying to persuade him. But now Steve is more amenable to doing another one. Yet we still have the issues about the direction we'd like to take. I'm in the future; Steven's in the past. He's trying to drag it back to the way they were, I'm trying to push it to a whole different place. So, still we have a sort of tension. This recent one came out of that. It's kind of a hybrid of our own two ideas, so we'll see where we are able to take the next one."

for the full interview, which gives an interesting glimpse into the filmmaker's life. We'll be sure to keep you updated with more on a new Indiana Jones film as soon as more information surfaces.

Indiana Jones and the Kingdom of the Crystal Skull was released May 22nd, 2008 and stars Harrison Ford, Cate Blanchett, Karen Allen, Shia LaBeouf, Ray Winstone, John Hurt, Jim Broadbent, Igor Jijikine. The film is directed by Steven Spielberg.