Premise: Zim dreams of greatness. Unfortunately, though, he's hopelessly inept as a space invader. Desperate to be rid of the annoying Zim, his planet's leaders send him on a mission to infiltrate Earth, providing him with leftover, cobbled-together equipment. To their consternation, Zim succeeds in setting up a base on Earth and infiltrating human culture, posing as a human child as he plots the planet's downfall. Only Zim's archnemesis, Dib, recognizes that Zim is an alien, and of course, nobody believes Dib's claims.
S01, E01 (First Aired: Mar. 30, 2001)
Zim and Gir plot the destruction of Earth.
S01, E03 (First Aired: Apr. 13, 2001)
Zim befriends Keef, then cannot get rid of him; Dib takes pictures of Zim's secret lair.