Torchwood (2006)

S1E2 Day One

Gwen is starting her first day at Torchwood, but things quickly take a turn for the worse. She inadvertently unleashes a strange gas from a recently fallen comet, which gives rise to a new breed of alien that has a dangerous obsession with sex. As this perilous creature roams the streets, Torchwood races against time to locate the host and stop any further fatalities caused by its aggressive behavior.