Mimic (Edge of Tomorrow)

"The thing you've got to understand is this is a perfectly evolved world-conquering organism. For all we know, there are millions of those asteroids floating around in the cosmos like a virus. They're just waiting to crash-land into a world with just the right conditions."

- Dr. Carter

Mimics are a species of extraterrestrial life forms which came to Earth in an asteroid to claim the planet, waging war against Humans. They operate in a hive mind and are notable for their ability to rewind time when they're killed, creating temporal loops.

Biology
Mimics are extremely fast and agile creatures with numerous tentacles, which can be used for moving on land, climbing, or digging through the soil to emerge and ambush unsuspecting prey. They are all part of a single hive mind, which consists of three castes: the common Drones, the commanding Alphas, and a single gigantic Omega, which acts as the colony's central brain.

It's not known how many of them are in the universe, but it's been speculated that there might be numerous asteroids carrying Mimic hives, waiting to land on suitable planets for them to colonize.

Drones
The Drones are by far the most common, and are not capable of resetting time on their own. They aren't as large as Alphas, and can be easily identified by their orange bioluminescence. As soldiers, they are virtually unstoppable, capable of moving at incredible speed, altering the shape of their bodies, and shooting out explosive projectiles. A common tactic for them is to bury themselves underground to take their targets by surprise.

Alphas
Alphas, in contrast, are extremely rare. Dr. Carter estimated that just 1 in every 6.18 million Mimics is an Alpha. They are larger than Drones, and have light blue luminescence, rather than orange; but are most notable for acting like the hive's nervous system, connecting the Drones to the Omega (which is the brain). Whenever an Alpha is killed, it triggers the Omega's chronokinetic response to reset time to one day before that occurrence, while retaining memories of it. In this way, the Mimics learn about the enemy's strategy and have a chance of responding preemptively, as well as resetting time continuously until reaching a favorable outcome.

Being in contact with the blood of an Alpha Mimic may cause a Human being to enter this same loop as well. From that point on, every time the Human is killed, time will be reset to the day before they were killed originally. However, this ability will not last if the Human's own blood is replaced later, such as in the occurrence of an accident that leads to a medical transfusion.

Omega
The Omega is the core of the Mimic superorganism, and acts as its central intelligence, as well as the source of its temporal abilities. It is telepathically connected to all Mimics, and may also establish psychic links to other creatures who have been in contact with Alpha blood. The Omega itself is a massive spherical organism and seemingly needs to be contained in water. Destroying the Omega results in the loss of the hive mind itself, leaving the rest of the Mimics vulnerable and easy to take down.

History
The Mimics first arrived in a meteor which hit the Earth near the city of Hamburg in Germany, from which they began to spread across Europe, killing millions of people.

Appearances

 * Edge of Tomorrow (2014)