The Humans are a group of astronauts that have come to Mars in search of green energy crystals found on the Martian surface. In the storyline they are using them to power their futuristic devices, unfortunately for them the Aliens want them too.
The Human structures consist of two colors, orange and white. There are a range of astronaut members in the Mars Mission line, according to LEGO Battles, they are led by Biff and Gemm.
The aliens have came from an unknown place in the universe, also searching for the crystals, they are not from Mars (according to the LEGO magazine and LEGO battles). The aliens themselves are transparent green and glow in the dark. Alien Commanders are the leaders of the alien army. The aliens are shown to live in underground hives. In 2008, it appeared that the aliens have been found, and the hives were destroyed. According to LEGO Battles, there is an Alien Queen. The alien queen has looks like an alien commander, but her legs are the same as a Spy Clops.
LEGO revived an older, forgotten feature in this new theme. The pump system, which was pioneered in one of the previous space ranges Life on Mars. In Mars Mission, it is white and orange, instead of the purple, tan, and other rare colors or Life on Mars.
The crystals are one of the main reasons that the Humans and Aliens came to Mars. Both races wish to use these crystals for power sources, which can be used to supply energy to all of their respective vehicles and other systems. These energy crystals are similar in function to those of Life on Mars.
This months featured image depicts three of the old space themes, Blacktron Future Generation also known as Blacktron II, M-Tron and Space Police II. It is a promotional image part of a LEGO catalog released in 1992, the year Space Police II was released. The Image includes descriptions of the three themes.
The Thunder Driller drove through everything in it's way, pebbles or boulders. Duke and Doc rode inside, with the monitor searching for any specimens of crystals. All of the sudden, the monitor started beeping rapidly. They thought they had found a large amount of crystals. But they were wrong.
A large Rock Monster, known as a Meltrox, came running towards it, trying to knaw it open. Someone had to go out and stop it. Duke volunteered, being experienced with facing these species of Rock Monsters. He opened the hatch and found the Meltrox knawing at the wheel.
"Sorry, little feller, off you go!". Duke hit a control which turned the wheel shortly but quickly, sending the Meltrox flying...