Futurama: The Butterjunk Effect

SINOSSI

Leela and Amy take part in the butterfly derby, a sport that sees two pairs of women don wings and try to knock each other out of the sky - only to become addicted to a steroid that makes them aggressive, masculine and downright mean. However, while they're dressing up as winged insects, Fry has the misfortune of undergoing a drastic real-life transformation after falling foul of an angry male butterfly.