Mars Mission Mars Mission is a Space theme that debuted in August of 2007 , and was officially discontinued by 2009 . The theme focuses on the adventures of a team of Astronauts as they land on Mars and are forced to contend with a dangerous alien race . < br > Sets in the theme were released for two consecutive years , and almost every one of them focused on a vehicle under control of either the humans or the aliens , the only exceptions being 7690 MB - 01 Eagle Command Base , and 5616 Mini Robot . < br > The theme was , in a sense , a sequel to the previous Space subtheme , " Life on Mars " , although Life on Mars featured a peaceful martian race , rather than a war between humans and aliens . Factions . The Astronauts . The humans are a group of astronauts that have journeyed to Mars in search of powerful yellow - green energy crystals found on the Martian surface . In the storyline , the humans are mining the crystals for a new source of energy , as Earth is experiencing an energy crisis . Unfortunately for the Astronauts , the Aliens are also seeking the crystals for themselves . The human structures consist of two colours : orange and white . They have the " Classic Space symbol " . There were a range of Astronaut members in the Mars Mission theme ; according to LEGO Battles , the Astronauts were led by the Astro Commander , a leader of the Astronauts in the game who appeared during cutscenes . The expedition was then followed by two commandos named Biff and Gemma . The Aliens . The Aliens have originated from an unknown place in the cosmos , and are also searching for the crystals . In actuality , they are not from Mars , and are immediately identified as a dangerous and invasive force by the Astronauts . The Aliens themselves are transparent green and glow in the dark . Alien Commanders are the leaders of the Alien army . The army attacks any human encampments and Astronauts that they encounter . The Aliens are shown to reside in underground hives . In 2008 , it appeared that the Aliens had been routed , and the hives were destroyed . According to LEGO Battles , there is an Alien Queen . The Alien Queen has the appearance of an Alien Commander , but her legs resemble those of Spy Clops from the Agents theme . There are also four legged spider - like robots which fill the role of builder in Lego Battles . There are also silver humanoid robots called Laser Troopers which are exactly like Devastator from the Exo - Force theme , they shoot green laser bolts . Also , in LEGO Battles , the Aliens only wanted the crystals to power up their mothership to leave the planet . Features . Pump System . LEGO revived an older , somewhat forgotten feature in this new theme . This was the pump system , which was pioneered in one of the previous Space ranges , namely Life on Mars . In Mars Mission , the system is coloured in white and orange instead of the purple , tan , and other rare colours defining the Life on Mars theme . It features in the sets 7690 MB - 01 Eagle Command Base and 7691 ETX Alien Mothership Assault . Crystals . The Crystals are one of the main reasons that the Humans came to Mars . Both races wish to use these crystals as power sources , which can be used to supply energy to all of their respective vehicles and systems . These green energy crystals are similar in function to the Biodium ore in the Life on Mars theme . They can be found in almost every Mars Mission set . They are found in subterranean caves or embedded in the Martian soil . They are scanned with sensors , named Crysta - sensors , to see if they are pure . The Crystals are then promptly shipped to the nearest human base . In LEGO Battles , the astronauts and aliens also compete to locate a purple variant of the energy crystals , which are apparently far more powerful than their green counterparts . Online Attractions . Like most LEGO themes at the time , Mars Mission had a website accessible from LEGO . com . The Mars Mission site had two games , a product information page , a download page , and an " Astronaut Log " showing letters from the Astronauts . One of the games , CrystAlien Conflict , was immensely popular with LEGO . com users . The game puts the user in the role of commander for either the Astronaut faction or the Alien faction . At the main menu of the game , there is an ' access code ' box that the user can type secret codes into . The letters appear in Alien font when typed . Here are some of the secret codes :