The aliens are invading the city and the Earth Defence HQ is the ultimate station! Unhook the laboratory trailer for high-speed pursuits, repel the UFO with the interceptor shuttle, fire the ground defence unit flick missiles, study the Alien Android and Alien Clinger in the analysis bay and keep them behind bars in the prison pod, and recover civilians with the mini rescue vehicle. Set includes Alien Android, Alien Trooper, Alien Defence Unit soldier and toxic cleanup scientist minifigures, Alien Clinger and assorted weapons.