"Billy" is episode 6 of season 3 in the television show Angel. Written by Tim Minear and Jeffrey Bell and directed by David Grossman, it was originally broadcast on October 29, 2001 on the WB television network. In this episode, Angel investigates a wave of violence against women throughout Los Angeles, caused by Billy's ability to infect men with murderous misogyny. Cordelia seeks the aid of Lilah, who is a victim of Billy’s power, while Fred finds herself in danger from an infected Wesley.