Grey's Anatomy: Season 2, Episode 21

Superstition

When a series of deaths occur at Seattle Grace, the uncanny events bring out the doctors' superstitious sides. Four deaths in the morning implies that three more deaths are due for the day. This makes Izzie nervous about Denny's surgery, and a jealous Alex informs Denny of the likelihood of his death, prompting Izzie to completely end their relationship. Meanwhile, Derek and Addison discuss making a more permanent living arrangement, and Dr. Webber treats a former sponsor from his alcoholic's anonymous group. Izzie kisses Denny after he survives his surgery.