A mugging victim turns vigilante after Fraser and Ray teach self-defense to senior citizens.

A clip-filled episode of highlights from the first 99 episodes of Seinfeld.

Part two of the 100 episode mark celebration with clips from the previous 99 episodes.

Mark is invited to join the staff as an attending physician. Later, he treats a woman with breast cancer, who begs him to kill her. Deb wows Benton with her presentation, leaving Carter in the rear again. A poisonous snake gets loose in the ER. Benton offends Haleh, who spends her day making his job more difficult. The ER gets new crash carts, which are promptly stolen by cardiology.