Fans have been divided over the merits of "The Kingdom of the Crystal Skull" but executive producer and series co-creator George Lucas admits to the Times Online (http://www.timesonline.co.uk) that director Steven Spielberg wasn't too enthusiastic about the fourth one.

"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."

He went on to say that nobody has ruled out a fifth one yet. "If I can come up with another idea that they like, we’ll do another."