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.

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.

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

On Ben Sherman's final day as a rookie, challenges abound – none more daunting than how to handle his partner's growing reliance on painkillers.

The team searches for a missing trial consultant and tries to narrow down the list of suspects involved with his disappearance. Meanwhile, Samantha and Jack adjust to Brian spending more time with their son, Finn.