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The Power Mammoth was released by Hasbro during the NAR line. It was one of three Zoids that shared the "Power" prefix; the others being the Power Mantis, and the unreleased Power Kong . The Zoid was released right before the NAR line's cancelation. As a result, the Zoid was slightly overstocked, with the leftover stock being sold in Europe, mostly in the United Kingdom.
Due to the Zoid being a Hasbro exclusive, and never released in Asia, no offical backstory was given on the Zoid, however the stickers indicate it was a Zoid of the Guylos Empire