Mars Mission

Mars Mission was a very popular theme, that started in 2007 and ended in 2009 replaced by Space Police, also known as SP. The sets were:
 * 7697 Claw Tank Ambush
 * 7692 Recon Dropship
 * 7690 Eagle Command Base
 * 7691 Alien Motership Assault
 * 7699 Armoured Drilling Unit
 * 7695 Astro Fighter
 * 7694 Trike
 * 7693 Alien Strike
 * 5616 Mini Robot
 * 5619 Crystal Hawk
 * 5617 Alien Jet
 * 7645 Crystal Reaper
 * 7644 Hypersonic Operations Aircraft
 * 7647 Switch Fighter
 * 7646 Alien Infiltrator
 * 7648 Mobile Mining Unit
 * 7649 Ultra Drill Walker

Though it was made later, It was considered Classic. It was in the Space line of LEGO, hich now became Alien Conquest.