The Mysterians
Jeff Nathanson met with Spielberg and Lucas in August 2004, and turned in the next drafts in October and November 2005, titled "The Atomic Ants". David Koepp continued on from there, giving his script the subtitle "Destroyer of Worlds", based on the J. Robert Oppenheimer quote. It was changed to "Kingdom of the Crystal Skull", as Spielberg found it more inviting a title and actually named the plot device of the crystal skulls. Lucas insisted on the "Kingdom" part. Koepp's "bright [title] idea" was "Indiana Jones and the Son of Indiana Jones", and Spielberg had also considered having the title name the aliens as "The Mysterians", but dropped that when he remembered that was another film's title. Koepp collaborated with "Raiders of the Lost Ark" screenwriter Lawrence Kasdan on the film's "love dialogue."