A darkly funny sci-fi series that premiered on Nickelodeon in the early aughts, Invader Zim chronicles the escapades of Zim, an alien from the planet Irk fixated on conquering Earth with the help of an inept robot servant named GIR. Invader Zim lasted just two seasons, but it has had a lasting impact on pop culture—an Invader Zim feature film is set to be released on Netflix later this year.