Alien Infiltration

Alien Infiltration

Earth governments can be infiltrated by alien agents which are human in appearance. This can result in official contact between aliens and governments at the highest level. The climax of this activity is characterised by intense UFO activity in the vicinity of major cities. The aliens will attempt to sign a pact with an earth government by offering knowledge of their superior technology. In return the government will allow the Aliens to conduct their activity unhindered. This Alien mission represents the worst threat to XCom. If a government agrees to a pact then its funding will cease.

Source: UFO: Enemy Unknown UFOpaedia

The aliens will score 150 points for this mission. In addition, a country will cease funding X-Com, and an alien base will be constructed.

Initially, several Scouts will perform investigations prior to the main infiltration attempt.

In the main Infiltration wave, a Large Scout will appear, followed by a Terror Ship, Supply Ship and two Battleships. Shooting down any of these craft before they slow down will delay the next craft by a couple of days; if the craft are ignored even for a short while, long enough to slow down, the sequence proceeds extremely quickly. Shooting down the UFOs or assaulting the landed ships will NOT stop the infiltration from succeeding. Shooting down the earlier ships will delay, but not entirely stop the second Battleship. The moment the second Battleship appears in Earth's atmosphere, the infiltration is successful and complete. The country infiltrated will still provide funding at the end of the month when the second Battleship arrives (due to the way funding is handled), but its contribution will be set to zero in all future months, directly harming X-Com's wallet.

Always search for the alien base after the second Battleship, as otherwise it will continue to score points for the Aliens.