Japanese for "Super Alloy." Originally coined by animator Nagai Go as a gimmick for his Mazinger Z series, "chogokin" was co-opted by Popy Toy of Japan for use as a brand name. In general use, it refers to most diecast metal robot character toys. More specifically it is the exclusive brand name for robot character toys produced by Popy Toy and Bandai, Popy's parent company. The success of the chogokin toy line spawned a host of competitors selling diecast character products under a variety of similar names, including but not limited to "Bigger Gokin," "Arklon," "Super Gokin," "Zinclon," and many others. Most, if not all, of these diecast toys were made from a zinc alloy.

Chogokin - Sometimes Chougokin or Cho-gokin - (超合金) is Japanese for "super Alloy" and is a fictitious material which first appeared in Go Nagai's Mazinger Z comic. It was later adopted by the Popy Toy company in 1972 as the name of a new line of die-cast metal robot and character toys sold in Japan. The very first of these toys was the "GA-01" Mazinger Z, which in spite of questionable engineering that led Popy to offer a free replacement campaign, ignited a craze that changed the face of the Japanese toy industry in the 1970s.