"...focused on the daily life of Zim, a naïve but psychotic alien from the planet Irk who tries to conquer Earth, before his attempts are constantly thwarted in a humorous manner by Dib, a young paranormal investigator and the only one (along with his sister Gaz) who knows with certainty Zim is an alien (although no one believes him), or by his own naïveté."--Wikipedia.com.