Designation: Sentient (hive mind)
Appearances: Edge of Tomorrow
Mimics are a race of unknown origin who landed on Earth and quickly conquered much of Europe. They unerringly anticipated their enemies strategy – earning them the name mimics but truthfully they were able to achieve this by manipulating time to repeat a battle until they won it
I just love a properly weird alien design. The knotted black tangles of the Mimics conveyed immediate threat and also varied the ways they attacked, making the Edge of Tomorrow antagonists truly alien.