Although "Great Mazinger" did not achieve the same astronomical ratings as "Mazinger Z", it was still highly popular to run a very successful 56 weeks. In fact, it even spawned a line of best-selling toys and merchandise as did its predecessor, as well as several spin-off theatrical featurettes. For example, it paved way for the creation of "UFO Robo Grendizer". In addition, a footage from Great Mazinger's sole appearance in the final episode of "Mazinger Z" was aired as part of the US version of "Mazinger Z", known as "Tranzor Z". At that time, however, Great Mazinger had already been introduced to millions of American children under the name of "Mazinga". As one of the imported products, the 24-inch Jumbo Machinder toys were released in the US by Mattel as part of their Shogun Warriors line in 1976.