When does Invader Zim return?

Invader Zim is an American animated science fiction horror comedy television series. The series centers on the titular character Zim, an extraterrestrial from the planet Irk. The show originally aired on Nickelodeon from 2001 to 2002, with six of the completed second-season episodes going unreleased. A monthly comic book series of the same name was released on July 8, 2015, as a continuation of the television series and published by Oni Press until August 4, 2021.