theme is generally considered to be part of classic Lego Space. This was the first theme to feature two types of minifigures: human astronauts (from Lego Town) and Martian aliens (native to Mars). The sets denote peaceful coexistence between the two species on the planet Mars. The Life on Mars theme pioneered several unique aspects of Lego. It used a pneumatic pump system capable of sending Martian minifigures through tubes in the 7317 Aero Tube Hangar set. This system would later be seen in the Mars Mission theme to shoot missiles. The theme also introduced several new muted colors to the Lego color palette, including Sand Green, Sand Blue, Sand Red, and Sand Purple. Sets were designed to separate into segments easily to encourage children to mix and create their unique vehicles out of human and alien sets. The Humans had a white and blue color scheme, while the Aliens had a variety of colors. Martians in the Life on Mars theme were unique in that they were named after real-life stars and constellations: Altair, Centauri, Antares, Canopus, Pollux, Vega, Arcturus, Cassiopeia, Mizar, and Rigel. Mars Mission (2007–2008) Mars Mission is the second Mars space theme to feature both humans and aliens and is a reboot of Life on Mars. Unlike Life on Mars, the aliens (an alien race from another planet) and humans were adversaries. Like with Life on Mars theme, this set is generally viewed as a sequel to the first Martian sets. Space Police III (2009–2010) 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 human-looking villains, like Blacktron or Spyrius. It is also the first Space Police theme to include enemy ships instead of just prisoners and is the first Space Police theme in 16 years. A gang, including: Kranxx, Snake, the Skull Twins, Slizer and Squidman, are the main troublemakers for Space Police III with independent, Frenzy, keeping them busy as well. However, Rench bears the old Blacktron Future Generation logo on his uniform (which is an updated original Blacktron uniform), hinting that he may have a connection with the old Blacktron faction, as well as hinting that the Space Police are in the same continuity as their older versions. Alien Conquest (2011) Alien Conquest was