Supernatural: 10 Best Characters Who Only Appeared In One Episode

In season 7, Dean Winchester has a one-night stand with a woman called Lydia, a member of a tribe of Amazons. These are not Wonder Woman's cool world-saving Amazons but the malevolent kind. They wouldn't be Supernatural villains otherwise. Lydia's tribe only uses men for breeding and then kills them afterward. They seek good-looking men, get pregnant by them, then get rid of them.

These Amazons also grow up incredibly first. Dean’s daughter Emma only takes two days from conception to birth. Once born, Emma grows up years in mere hours. She grows up so fast that her father isn’t even aware of her existence by the time she's an adult.

The aging of the Amazons only slows down to a normal human rate after they turn sixteen. The Amazonian women have brutal rites of passage that involve eating human flesh and killing their fathers. Emma calls on Dean, lying about leaving her tribe only to turn on her father once he has let her in. Dean hesitates at killing his daughter. His brother Sam doesn’t. He shoots her in the chest.