It was broadcast on Japanese television from October 5, 1975, to February 27, 1977, and lasted 74 episodes.  The robot's first appearance in the United States was as a part of the Shogun Warriors line of super robot toys imported in the late 1970s by Mattel, then in Jim Terry's Force Five series, both under the title Grandizer.
It is still widely popular in the Middle East, and it was especially popular in France and Quebec, as well as among French speaking Canadians in the province of New Brunswick, where it was aired under the title Goldorak. In Italy, the series was as popular and known as Goldrake. High Dream produced these 2-packs as a one-off web exclusive in 2016. These 2-packs will never be reproduced anymore.
Only 500 were made worldwide. The item "High Dream Grendizer Danbei & Goro 2-pack limited edition 500 pieces" is in sale since Thursday, September 19, 2019.This item is in the category "Toys & Hobbies\Action Figures\Transformers & Robots". The seller is "pbmexpressusa" and is located in Clermont, Florida. This item can be shipped worldwide.