After the success of Indiana Jones and the Kingdom of the Crystal Skull, which now stands as the third highest grossing film of the year behind Iron Man and The Dark Knight, notions of a fifth movie are in the air. Newsweek is reporting that George Lucas has no plans to cede the fedora to Shia LaBeouf, who portrayed Indy's son, Mutt Williams, insisting that Harrison Ford must be on board.

"He is Indiana Jones," Lucas said of Ford. "If Indiana Jones wasn't in it, you'd have to call it 'Mutt Williams and the search for Elvis.' ... "Yeah, it's 'Mutt Williams and the Search for Elvis.'"

Lucas also added that there is the possibility of a fifth movie, provided Harrison Ford is on board and he comes up with an interesting idea.

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"The franchise really depends on me coming up with a good idea," Lucas said. "And that series is very research-intensive. So we're doing research now to see if we can't come up with another object for him to chase ... hopefully we'll come up with something."

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