Project 4-12 is the earliest and most long-lived creation of Mixmaster. He was created by in 1973 and was bred for combat in Vietnam, specifically designed to hunt down the Vietcong in the jungles of Hochi Provence in a nocturnal environment and clear out tunnels. The lab he was created in was closed thanks to Proudfoot's shady dealings and Cletus Poffenberger, his creator, couldn't bare to let the young animal die before it had a chance to live stole him away from the secret Proudfoot Corporation building in Perfection, Nevada before it was destroyed and instead was taken on the run with it from both the corporation and the government.