[areaseven]

Seiun Kamen Machineman is a 1984 TV series created by Shotaro Ishinomori. In the series, Nick (a.k.a. Ken Takase), a college student, travels to Earth to study human behavior as part of his doctorate. When he discovers that the Tentacle Organization is out to rid the world of children, he decides to stay on Earth to protect his girlfriend Maki and the youth of the world as Seiun Kamen Machineman.

Yeah, I still can't believe Ishinomori came up with this...

EDIT: Since Toei is still on a copyright rampage, here's an image gallery.

Seiun Kamen Machineman