Thai Douglas

The residents travel to San Francisco for the oral boards; sparks fly when Richard and Catherine (Debbie Allen) bump into each other at a hotel; Alex feels guilty.

The residents agonize over their upcoming exam results; Arizona's childhood friend needs medical help; the doctors try to help a patient missing one third of his skull; Julia wants to start a family with Mark.

The team investigates a series of home invasions involving casualties in upscale San Diego neighbourhoods.

Christa must ignore her personal feelings as she and Grace treat a patient who says he was abused at a camp for troubled teenagers; Campbell surprises Grace by asking her out on a date.

After rescuing a woman, a subway hero collapses. House is unable to determine the man's illness. Meanwhile, Cuddy's mother visits and Taub's wife's libido is aroused.

The team must help an injured former Secret Service agent regain his memory in order to stop the launching of weapons of mass destruction.