一名想要征服地球的外星人ZIM 假扮成人类，而只有一个妄想狂的小孩Dib Membrane知道这个秘密。本剧于2001年3月30日在美国和菲律宾首播。
Zim是来自外星来的小孩,应该说是入侵者,但他在自己不知道的情况下,被母星放逐,不知不觉来到了地球...
以小学生的身分在地球生活,虽然说是入侵者,但是几乎都没在进行侵略的动作...(反而在我看过的集数中,拯救地球两次= =")
而且还要面对面前的敌人-Dib的侵扰(在我看来像是骚扰),Dib是唯一知道Zim是个外星人的地球人,但是因为也是个小孩子,所以没人相信他.
Zim与Dib是同校又同班的敌人(或者说是一对活宝),不时会进行互相乾扰的...笑话
Invader Zim的动画进行是有点类似PPG(飞天小女警),30分钟演两话,1话12分钟左右,所以每一话几乎都充满笑点....

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.