Charles Emmett

Derek asks Meredith to work with him in neuro again; Catherine Avery (Debbie Allen) comes back to Seattle Grace and takes an interest in Richard; Cristina becomes increasingly suspicious of Owen; Morgan may be falling for Alex.

Lois and Hal lose their collective cool when Hal's doctor finds something suspicious during a routine checkup.

When Caroline and Max join Sophie at the racetrack as guests of Sophie's new bookie boyfriend, Nicky (guest star PETER ONORATI – Rizzoli & Isles), Caroline's reignited love for horse racing gets out of hand.

When the Hollywood Reservoir dam breaks, Bobby and the 118 race into action to save passengers on a city bus that has crashed into a building several stories in the air; the team adjusts to life as first responders during the pandemic.

Lincoln and the team go to Las Vegas where Sucre gets an indecent proposal; Sarah finds out about Michael's condition; Roland pushes his luck; T-Bag and Gretchen team up; the secrets in Whistler's bird book are revealed.