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The Aliens invasion of Earth is a gradual affair; it starts off slow but builds up rapidly. This page will detail when the Aliens gain access to new missions, species, and UFOs for their invasion.

The ticker[]

The game measures the progress of the invasion using a variable known as the "alien ticker" or just "ticker". The ticker starts at 0 at the start of the game and increases slowly as the game goes on, with it capping out at a value of 800.

The ticker increases at a constant rate, alien activity does not affect this rate and it can never decrease. Specifically, it increases every in-game minute by a minuscule amount, which equates to about ~3.336 per day, or about 100 per month. Since most, if not all, cases of the aliens "stepping things up" happen when the ticker is at a multiple of 50, the aliens' progress can be nicely summarized on a month-by-month basis, though a fair deal of events will happen about halfway through a given month.

This base rate is only affected by the current difficulty, at superhuman the ticker rate is 100% of the base rate (~100 per month) while at Easy it's at 70% the base rate.

Month 1[]

Alien Missions[]

UFOs[]

Light Scout unlocked.[]

  • Used in Scouting and Research missions
  • Midway through the month: Phased out of Scouting missions; continues to perform Research missions

Midway through the month: Scout unlocked.[]

  • Replaces Light Scout in Scouting missions

Alien Races[]

Caesans and Sebillians available

Month 2[]

Alien Missions[]

UFOs[]

Fighter unlocked[]

  • Used in Air Superiority missions and as escorts

Light Scout[]

  • Phased out of: All missions

Scout[]

  • Replaces Light Scout in Research missions

Midway through the month: Corvette unlocked[]

  • Used in Ground Attack missions

Alien Races[]

Androns and Light Drones are available

Month 3[]

Alien Missions[]

UFOs[]

Fighter[]

  • Continues performing Air Superiority missions and escort duties

Scout[]

  • Phased out of: Research missions
  • Continues performing Scouting missions

Corvette[]

  • Now performs: Terror, Base Attack, Research, and Supply Run missions
  • Midway through the month: Now performs Construction missions
  • Continues performing Ground Attack missions

Bomber unlocked[]

  • Used in Bombing Run missions

Alien Races[]

Reapers are available

Month 4[]

Alien Missions[]

All Alien Missions unlocked.

UFOs[]

Fighter[]

  • Phased out of: All missions

Heavy Fighter unlocked[]

  • Replaces Fighter in Air Superiority missions and as escorts

Scout[]

  • Continues performing Scouting missions

Corvette[]

  • Phased out of: Terror missions
  • Midway through the month: Phased out of Base Attack, Ground Attack, Construction, and Supply Run missions
  • Continues performing Research missions

Landing Ship unlocked[]

  • Now performs: Terror missions
  • Midway through the month: Now performs Base Attack, Ground Attack, Construction, and Supply Run missions

Bomber[]

  • Continues performing Bombing Run missions

Alien Races[]

Harridans and Medium Drones are available.

Month 5[]

UFOs[]

Heavy Fighter[]

  • Continues performing Air Superiority missions and escort duties

Scout[]

  • Continues performing Scouting missions

Corvette[]

  • Phased out of: All missions

Landing Ship[]

  • Now performs: Research missions
  • Phased out of: Terror and Ground attack missions
  • Continues performing Base Attack, Construction, and Supply Run missions

Midway through the month: Cruiser unlocked[]

  • Now performs: Terror and Ground attack missions

Bomber[]

  • Continues performing Bombing Run missions

Alien Races[]

TBA

Month 6[]

UFOs[]

Heavy Fighter[]

  • Continues performing Air Superiority missions and escort duties

Scout[]

  • Continues performing Scouting missions

Landing Ship[]

  • Phased out of: Construction and Research missions
  • Continues performing Base Attack and Supply Run missions

Cruiser[]

  • Now performs: Research missions
  • Continues preforming Terror and Ground attack missions

Bomber[]

  • Phased out of: All missions

Strike Cruiser unlocked[]

  • Now performs: Bombing Run missions

Alien Races[]

TBA

Month 7[]

UFOs[]

Heavy Fighter[]

  • Phased out of: All missions

Interceptor unlocked[]

  • Now performs: Air Superiority missions, escort duties

Scout[]

  • Continues performing Scouting missions

Landing Ship[]

  • Phased out of: Base Attack missions
  • Continues performing Supply Run missions

Cruiser[]

  • Midway through the month: Phased out of all missions

Carrier unlocked

  • Now performs: Construction and Base Attack missions
  • Midway through the month: Now performs Ground Attack and Research missions
  • Continues performing: Construction missions

Midway through the month: Battleship unlocked[]

  • Now performs: Terror missions

Strike Cruiser[]

  • Continues performing Bombing Run missions

Alien Races[]

TBA

Month 8[]

UFOs[]

Interceptor[]

  • Continues performing Air Superiority missions and escort duties

Scout[]

  • Continues performing Scouting missions

Landing Ship[]

  • Continues performing Supply run missions

Carrier[]

  • Continues performing Ground Attack, Base Attack, Research, and Construction missions

Battleship[]

  • Continues performing Terror missions

Strike Cruiser[]

  • Continues performing Bombing Run missions

Alien Races[]

TBA

Month 9[]

UFOs[]

Interceptor[]

  • Continues performing Air Superiority missions and escort duties

Scout[]

  • Continues performing Scouting missions

Landing Ship[]

  • Continues performing Supply Run missions

Carrier[]

  • Phased out of: Ground Attack missions
  • Continues performing: Base Attack, Research, and Construction missions

Battleship[]

  • Now performs: Ground Attack missions
  • Continues performing Terror missions

Strike Cruiser[]

  • Continues performing Bombing Run missions

Alien Races[]

TBA

Month 10[]

UFOs[]

No further changes to UFO missions

Alien Races[]

All Alien races unlocked

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