Jhonen Vasquez, also known as Chancre Scolex or simply Mr. Scolex, is an American comic book writer, cartoonist and music video director. He is famous for creating the comic book series Johnny the Homicidal Maniac and its spin-offs Squee! and I Feel Sick, all published under Slave Labor Graphics label. He also created the short-lived animated series, Invader Zim, which aired on Nickelodeon. After the success of Squee!, the children's cable network Nickelodeon approached Vasquez about producing an animated television series. The series, Invader Zim, focused on the daily life of Zim, a naïve alien from the planet Irk who tries to conquer Earth — however, his attempts are constantly thwarted in a humorous manner by Dib, a young paranormal investigator and the only one who knows with certainty Zim is an alien (although no one believes him), or by his own naïveté. The first episode aired on March 30, 2001. The series would last for two seasons, until it was abruptly cancelled by Nickelodeon, saying that the main causes of the show's cancellation were low ratings, over-budget production and lack of interest in continuation of the series. The last episode prior to the show's cancellation, "The Most Horrible X-Mas Ever" (a Christmas special), aired on December 10, 2002. Episodes for a possible third season, as well as a show's finale, then remained unproduced or unfinished. Vasquez provided the voices for Zim's computer and Minimoose, as well as many other additional voices, being credited under the name Mr. Scolex.