<Table> <Tr> <Td> <H3> Main cast (edit) </H3> <Ul> <Li> Ellen Pompeo as Meredith Grey </Li> <Li> Sandra Oh as Cristina Yang </Li> <Li> Justin Chambers as Alex Karev </Li> <Li> Chandra Wilson as Miranda Bailey </Li> <Li> James Pickens, Jr. as Richard Webber </Li> <Li> Sara Ramirez as Callie Torres </Li> <Li> Eric Dane as Mark Sloan </Li> <Li> Chyler Leigh as Lexie Grey </Li> <Li> Kevin McKidd as Owen Hunt </Li> <Li> Jessica Capshaw as Arizona Robbins </Li> <Li> Kim Raver as Teddy Altman </Li> <Li> Sarah Drew as April Kepner </Li> <Li> Jesse Williams as Jackson Avery </Li> <Li> Patrick Dempsey as Derek Shepherd </Li> </Ul> <P> </P> </Td> <Td> <H3> Recurring cast (edit) </H3> <Ul> <Li> James Tupper as Dr. Andrew Perkins </Li> <Li> Rachael Taylor as Dr. Lucy Fields </Li> <Li> Peter MacNicol as Dr. Robert Stark </Li> <Li> Scott Foley as Henry Burton </Li> <Li> Daniel Sunjata as Nurse Eli </Li> <Li> Loretta Devine as Adele Webber </Li> <Li> Jeff Perry as Thatcher Grey </Li> <Li> Nicole Cummins as Paramedic Nicole </Li> </Ul> <P> </P> </Td> <Td> <H3> Guest stars (edit) </H3> <Ul> <Li> Caterina Scorsone as Amelia Shepherd </Li> <Li> Kate Walsh as Addison Montgomery </Li> <Li> Jason George as Ben Warren </Li> <Li> Mark Saul as Steve Mastow </Li> <Li> Mandy Moore as Mary Portman </Li> <Li> Ryan Devlin as Bill Portman </Li> <Li> Frances Conroy as Eleanor </Li> <Li> Diane Farr as Laila </Li> <Li> Amanda Foreman as Nora </Li> <Li> Amber Benson as Corrine Henley </Li> <Li> Jamie Chung as Trina </Li> <Li> Adam Busch as an Fred Wilson </Li> <Li> Marina Sirtis as Sonya </Li> <Li> Nancy Travis as Allison Baker </Li> <Li> L. Scott Caldwell as Alison </Li> <Li> Amber Stevens as Laurel Pinson </Li> <Li> Laura Breckenridge as Julia </Li> <Li> Doris Roberts as Gladys </Li> </Ul> <P> </P> </Td> </Tr> </Table> <Tr> <Td> <H3> Main cast (edit) </H3> <Ul> <Li> Ellen Pompeo as Meredith Grey </Li> <Li> Sandra Oh as Cristina Yang </Li> <Li> Justin Chambers as Alex Karev </Li> <Li> Chandra Wilson as Miranda Bailey </Li> <Li> James Pickens, Jr. as Richard Webber </Li> <Li> Sara Ramirez as Callie Torres </Li> <Li> Eric Dane as Mark Sloan </Li> <Li> Chyler Leigh as Lexie Grey </Li> <Li> Kevin McKidd as Owen Hunt </Li> <Li> Jessica Capshaw as Arizona Robbins </Li> <Li> Kim Raver as Teddy Altman </Li> <Li> Sarah Drew as April Kepner </Li> <Li> Jesse Williams as Jackson Avery </Li> <Li> Patrick Dempsey as Derek Shepherd </Li> </Ul> <P> </P> </Td> <Td> <H3> Recurring cast (edit) </H3> <Ul> <Li> James Tupper as Dr. Andrew Perkins </Li> <Li> Rachael Taylor as Dr. Lucy Fields </Li> <Li> Peter MacNicol as Dr. Robert Stark </Li> <Li> Scott Foley as Henry Burton </Li> <Li> Daniel Sunjata as Nurse Eli </Li> <Li> Loretta Devine as Adele Webber </Li> <Li> Jeff Perry as Thatcher Grey </Li> <Li> Nicole Cummins as Paramedic Nicole </Li> </Ul> <P> </P> </Td> <Td> <H3> Guest stars (edit) </H3> <Ul> <Li> Caterina Scorsone as Amelia Shepherd </Li> <Li> Kate Walsh as Addison Montgomery </Li> <Li> Jason George as Ben Warren </Li> <Li> Mark Saul as Steve Mastow </Li> <Li> Mandy Moore as Mary Portman </Li> <Li> Ryan Devlin as Bill Portman </Li> <Li> Frances Conroy as Eleanor </Li> <Li> Diane Farr as Laila </Li> <Li> Amanda Foreman as Nora </Li> <Li> Amber Benson as Corrine Henley </Li> <Li> Jamie Chung as Trina </Li> <Li> Adam Busch as an Fred Wilson </Li> <Li> Marina Sirtis as Sonya </Li> <Li> Nancy Travis as Allison Baker </Li> <Li> L. Scott Caldwell as Alison </Li> <Li> Amber Stevens as Laurel Pinson </Li> <Li> Laura Breckenridge as Julia </Li> <Li> Doris Roberts as Gladys </Li> </Ul> <P> </P> </Td> </Tr> <Ul> <Li> Ellen Pompeo as Meredith Grey </Li> <Li> Sandra Oh as Cristina Yang </Li> <Li> Justin Chambers as Alex Karev </Li> <Li> Chandra Wilson as Miranda Bailey </Li> <Li> James Pickens, Jr. as Richard Webber </Li> <Li> Sara Ramirez as Callie Torres </Li> <Li> Eric Dane as Mark Sloan </Li> <Li> Chyler Leigh as Lexie Grey </Li> <Li> Kevin McKidd as Owen Hunt </Li> <Li> Jessica Capshaw as Arizona Robbins </Li> <Li> Kim Raver as Teddy Altman </Li> <Li> Sarah Drew as April Kepner </Li> <Li> Jesse Williams as Jackson Avery </Li> <Li> Patrick Dempsey as Derek Shepherd </Li> </Ul> <Li> Ellen Pompeo as Meredith Grey </Li>

When does cristina go back to work after the shooting