A new aspect of the game are the Creeper cards. While Keepers aid players in winning, Creepers such as Germs, The Army, and a slew of Pathetic Humans get in the way of conquest. Players must balance collecting Keepers with ridding themselves of Creepers to achieve the Goal before anyone else can.
All the mechanics aside, just look at the box. The front has a Martian tripod blasting a laser gun whilst the tripod abducts cattle, as well as humans panicking in sheer terror as alien fleets hover overhead. That alone should be convincing.