CSI Crime Scene Investigation

When a slab of concrete starts bleeding in midtown, the CSIs' investigation takes them into the underground world of hardcore fighting, where men moonlight as "weekend warriors" for the pleasure of a live viewing audience.

The CSI team investigates the murder of a blackjack dealer whose estranged husband has ties to a club of UFO believers.

Sara is uneasy about Grissom being reunited with Lady Heather during the CSIs' investigation of her attempted murder by a client she refuses to name.