There could be a fifth Indiana Jones movie, and it would still feature Harrison Ford.

That's because director George Lucas says Ford is Indy. Period.

Lucas says Shia LaBeouf's character is not Indy, and if Indy isn't in it, Lucas says, "You'd have to call it 'Mutt Williams and the search for Elvis.'"

Lucas says if there's going to be a fifth Indiana Jones movie, he has to come up with a good idea.

He says the series is "research-intensive." So, his staff is doing research now to see if there's "another object for him to chase."