Zim is a fictional character from the animated television series Invader Zim, created by Jhonen Vasquez. He is an alien from the planet Irk who is sent to Earth on a mission to conquer it. Zim is known for his green skin, large eyes, and distinctive robotic companion, GIR. His over-the-top personality and determination often lead to humorous situations. The show originally aired on Nickelodeon from 2001 to 2006 and has gained a cult following. It features themes of alien invasion, friendship, and the absurdity of everyday life. The unique animation style and dark humor contribute to its lasting appeal.