Did you see Sky Captain and the World of Tomorrow? The old Flash Gorden serials? Rocketman? The old Batman where he jumped into the turnk of his car to change into his costume?
Well I was thinking of running an erotic version of this genre- man will be men. women will be women and the adventures can be well fun. We could have you fighting the MARTIANS as they seek to capture Earth women to mate with. Or have the lost city of Atlantis try to conquer the world. Or have Emperor Wang with a sex ray out to screw around with the Earth. Or the Rocket Rangers fighting Planet X and its mutant tentacle monsters.
Rules- well will likely be a simple set of game rules.