Destroy All Humans 2: Make War Not Love

The sequel to the sleeper hit Destroy All Humans, you once again must take on the role of Crypto Sporidium 137 in an effort to, well, destroy all of the humans. The second game offers more missions, more upgrades to you weapons and abilities, and more emphasis on action (no stealth missions this time around). The game has been significantly lengthened compared to the first game, giving you more time to blow stuff up. It takes place in 1969 (don't worry, there are plenty off hippies and ninjas) and has you in a plot involving the cold war and a secret military agency.