The Irken Empire is a fictional alien civilization from the animated television series Invader Zim. It is known for its militaristic and expansionist nature, seeking to conquer other planets and expand its territory. The empire is ruled by the Tallest, a pair of leaders who are physically the tallest Irkens. They prioritize their own interests and often disregard the well-being of their subjects. Irkens are characterized by their green skin, large eyes, and antennae. They are technologically advanced, utilizing various gadgets and weapons in their conquests. The empire's most notable invader is Zim, who is sent to Earth on a mission to conquer the planet, despite his incompetence and obsession with proving himself.