The Powerpuff Girls, defenders of the fictional metropolis Townville, consist of the red-haired, level-headed leader, Blossom; the sweet, blonde, and often underestimated Bubbles; and the quick-tempered, black-haired Buttercup. According to series lore, the good-hearted scientist Professor Utonium was attempting to engineer perfect little girls in his lab when a mystery ingredient called Chemical X was accidentally added to the mix. The result was the three superheroines, whose round heads resembled powder puffs.