The Kikaika(Mechanization) Empire

The Four Machine Kings

Haguruma-Oh and Geeg The first opponent the Saurers faced was Haguruma-Oh. He was the lead for the initial invasion, and established the base on the dark side of the moon. He has a gear motif. The Kikaikajuu he creates are modified from broken machines by his lackey Geeg. He then combines with them with the command "Kikaikajuu Kyodai Kaiser" to power them up and commence mechanization using them.

Denki-Oh After Haguruma-Oh failed a few too many times, Kikaikami sent Denki-Oh to supplant Haguruma-Oh. Upon arrival, he terminated Hagurumah-Oh and took over his base, giving it a lightbulb motif. Personally he fights in Desvolt, and creates Kikaikajuu from military machines. If not for the timely discovery of Magnasaurer, he would have defeated Gosaurer completely.

Engine-Oh and Gilturbo After even Denki-Oh's powered-up Hyper Desvolt was unable to beat the Saurers, Engine-Oh stepped in. Unlike the others, he enjoyed fighting the Saurers. His mecha, Gilturbo is actually sentient and refers to Engine-Oh as "Father." He could combine Gilturbo with Kikaikajuu to power them up using the command "Kikaikajuu Kyodai Ketsuno." He renovated the base once more, using a engine motif. As far as creating Kikaikajuu, he sent metal "eggs" which then released a circuit board upon impact, which would convert anything nearby to the Kikaikajuu design stored in it. He almost defeated even King Gosaurer, but he discovered the human heart and sacrificed himself along with Gilturbo to protect Earth. When he is ressurrected as Engine-Daioh later, he seems to have lost the memories of this however.

Denji-Oh The Saurers had to travel back to the time of the dinosaurs to prevent the Kikaika Empire from taking Earth in the past and winning by default. In this era, the commander of the Kikaika forces was Denji-Oh. Using data from the destroyed Gilturbo's head, which had somehow preceeded them, he built a copy of King Gosaurer and piloted it against the Saurers. He also seemed to think that it was Eldoran himself who was piloting King Gosaurer.

The Emporer

Kikaikami The force behind the entire attack. He at first operates only behind the scenes, forming a temporary body out of parts on the moon base(as shown in the first picture) to berate his subordinates for failing. As finally even the combination of his four Machine Kings proves unable to defeat the Saurers, he completes the mechanization of the moon, linking all the mechanized planets into one huge network, and begins guiding the moon to impact with Earth, taking the energy form in the second picture.