Rebecca Hazlewood

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.

After his encounter with Hawking, Jack and the rest of the survivors find themselves back on the Island.

When a young woman comes in with a badly hurt ankle, Sam is shocked to learn how much they have in common. Jeanie Boulet (former series star Gloria Reuben - "The Agency") rushes into the ER after her son takes a fall during gym class. Meanwhile, when the higher-ups at the hospital don't take him seriously, Pratt finds himself wanting to quit his job. Recurring guest star Kari Matchett ("24," "Heartland," "Studio 60 on the Sunset Strip") also makes an appearance.

Abby checks out of rehab and makes her way back to the ER, but she finds herself being questioned by the other doctors. And when multiple victims of a fire come into the ER, Abby thinks that one of the little girls is suffering from LCA, a degenerative eye disorder. Meanwhile, Harold (recurring guest star Steven Christopher Parker) finds new confidence after a big night with Neela's cousin.

Eleanor's (Kristen Bell) eagerness to learn ethics from Chidi (William Jackson Harper) becomes the full-time job he never wanted. Meanwhile, Michael (Ted Danson) and Janet (D'Arcy Carden) focus their attention on a Neighborhood emergency.