Ren Hanami

Bailey arranges a domino kidney surgery involving all the residents and interns; Meredith is upset Derek didn't include her in the article on their clinical trial.

Beth navigates qualms with her mother; Kevin and Kate bring their families together for dinner.

The unit investigates when several young men and women are victims of disfiguring acid attacks. Meanwhile, Dr Reid settles into his new surroundings.

The doctors band together to save Pete's life after he suffers a heart attack, and Addison's mystery man reappears in a most surprising way.