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Stacked 1.21 Gigawatts Back To The Future T-Shirt Size:Small and everyone will know theThis Back To The Future t shirt shows Doc Brown's time traveling DeLorean. The shirt reads 1. 21 Gigawatts. In 1985, Doc Brown built a time machine out of a DeLorean, and when Marty McFly drove the car past 88 miles per hour, he was sent back in time to the year 1955. The only way that Marty could get back to the year 1985 was from the 1. 21 gigawatts of electricity generated from the bolt of lightning that hit Hill Valley's clock tower. Back To The