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Screwloose was once approched by the ThunderCats to assist Jagara in the repair of the Gyroscope. Unfortunatly, Mumm-Ra captured him and replaced his brain module with one of his own creation, causing the robot to alternate between good and evil behavior.
After he tried to destroy the Gyroscope and attacked Jagara, Lion-O used the Sword of Omens to restore him to normal operation. During the ensuing battle with Mumm-Ra, Screwloose actually defeated him by taking the Sword of Plun-Darr.
In the end, Screwloose remains behind on New Thundera to help Jagara maintain the gyroscope.
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