>>8924813>Great colour scheme with sand red, green, blue, yellow, and purple>No "filler" sets>Focused on exploration and cooperation instead of conflict>Modular vehicle gimmick>Aero-tube gimmick>Big walker has a "dock" that connects it to the base>Sets had a good selection of parts in a time when LEGO was juniorizing everything else>Parts weren't "theme specific" - if you get tired of space mechs you still have a shitload of useful parts generic enough to use for just about anythingLife on Mars was amazing for it's time and really deserved a second wave, it would have been cool to have some more vehicles for both sides - especially a big mothership like other space themes did.
Also, deep lore: [spoiler:lit]The trans-green aliens in Mars Mission aren't actually from Mars (they're invaders from somewhere else), and the theme's human forces are fighting them with the technology gained from the original Martians[/spoiler:lit]