The Grim Adventures of Invader Zim is an American animated science fiction-supernatural-comedy television film serving as a crossover between Invader Zim and The Grim Adventures of Billy and Mandy, being co-directed by Jhonen Vasquez and Maxwell Atoms. It is produced by Cartoon Network Studios, Warner Bros. Animation and Nickelodeon Animation Studios and it will premiere on CBS All Access on March-August TBDth, 2021.



As another tentative to take over the Earth, Zim discovers a portal that allows him to find another dimension where an entity known for working for two young children is tired of its life and has TBD.

Full plot

Voice cast


Critical reception




  • This is the third crossover between a Warner Bros. and a Nickelodeon property, with the first and second being Velocity and Samurai Jack: Demon's Edge and Batman vs. Teenage Mutant Ninja Turtles.
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