Lego Space Altair, Centauri, Antares, Canopus, Pollux, Vega, Arcturus, Cassiopeia, Mizar, and Rigel. "Mars Mission" is the second space theme to feature both humans and aliens and is a reboot of "Life on Mars". Unlike "Life on Mars", the aliens (a different breed of Martians) and humans were pitted against each other as children had been fond of doing with the original line. Space Police III continued the Lego trend of humans (or at least human-looking) versus aliens started in the former Mars Mission theme. This is the first time the Space Police have been pitted against monstrous looking aliens instead of
The Gods of Mars to Earth in pre-technological eras, particularly with the inclusion of kingdoms, empires or religious societies. Spacecraft may appear, but are not central to the story (something which makes these tales distinct from Space Opera, where spaceships are usually a key focus of the narrative). There were some Planetary Romances prior to the publication of the Barsoom novels, but "A Princess of Mars" and "The Gods of Mars" and other novels in the Barsoom series were the most influential on the numerous similar stories that were published subsequently. Burroughs's vision of Mars was loosely inspired by astronomical speculation of the time,