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The Royal House of Gadgetry later appeared, rebuilt, as part of Dark Specter's alliance. When the Royal House of Gadgetry were later destroyed by Rita and Zedd, the Machine Empire went into a period of inactivity, useless without the Royal House to lead it. After this invasion failed, King Mondo returned, causing Gasket and Archerina to flee. The two led the Machine Empire against the Zeo Rangers rather well, initiating a massive, all-out invasion on Angel Grove.
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Louie meant well, but squandered the Empire's forces, and was eventually overthrown by Mondo and Machina's eldest son, Prince Gasket, and his wife, Archerina.
It was during Mondo's absence that the Empire was led by Louie Kaboom, a renegade robot created by Lord Zedd and Rita Repulsa. Numerous monsters from the Empire perished at the Rangers' hands before King Mondo himself took to the battlefield and was destroyed by the Super Zeo Megazord. It was when the Empire arrived on Earth that they finally encountered a foe capable of repelling their forces, the Zeo Rangers. Possessing countless Cogs, Quadra Fighters, and monsters, the Machine Empire had already conquered an entire chain of galaxies before reaching Earth. The Machine Empire was a massive alien race and galactic empire of mechanical beings, led by the Royal House of Gadgetry.