- "That's Janus, a Roman mystical God."
- ―Rupert Giles[src]
Janus was a god worshiped in ancient Rome. A sculpture of the god's head, representing him with two faces—one male and one female—facing in opposite directions, was used by Ethan Rayne on Halloween 1997 to transform the population of Sunnydale into the characters of the costumes they had bought at his costume shop. Janus was often used to symbolize change and transition, thus explaining his role in Ethan's spell.