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The Demon Monstrux was a video game character in BraveLord and Monstrux. It was a multi-legged creature with purple skin and a long tongue.
An accident allowed the Demon Monstrux to escape the video game into the real world, and Emmett Brown became trapped inside the video game. This resulted in Marty McFly, Jules, and Verne Brown battling Demon Monstrux to force him back into the video game, and Doc out.