Chogokin (超合金, Chōgōkin, Chō: Super, gōkin: alloy) Sometimes spelled either Chougokin or Cho-gokin is a fictitious material which first appeared in Go Nagai's Mazinger Z manga and anime and is later adopted by Popy in 1972 as the name of a new line of die-cast metal robot and character toys sold in Japan.
The first of these is "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.
Bandai's Soul of Chogokin (SOC) line is probably the most famous example of this trend, featuring updated versions of many toys first made by Popy in the 70s and 80s.
It is also a way to create new, more easily available mecha toys for older shows such as Dancouga – Super Beast Machine God and Leopardon from Spider-Man.
The figures measure at approximately 140 mm (14 cm) in height and have less die-cast parts, but boast more articulation and have a wider range of accessory options.