City of the Gods included all the elements 'suggested' by George Lucas through the film's long development and that can be seen both in the final film and in earlier drafts like Indiana Jones and the Saucermen from Mars: a late 1950s setting, the presence of the Red Scare, aliens, UFOs, Soviet agents, army ants, somebody swinging on a vine, a chase on a rocket-sled and Indiana Jones surviving a nuclear blast inside a lead-lined refrigerator. Again like Kingdom of the Crystal Skull but unlike Saucermen from Mars, City of the Gods included a crystal skull as the story's McGuffin, and a returned Marion Ravenwood as Indy's love interest.