<Ul> <Li> Ellen Pompeo as Dr. Meredith Grey </Li> <Li> Sandra Oh as Dr. Cristina Yang </Li> <Li> Justin Chambers as Dr. Alex Karev </Li> <Li> Chandra Wilson as Dr. Miranda Bailey </Li> <Li> James Pickens Jr. as Dr. Richard Webber </Li> <Li> Sara Ramirez as Dr. Callie Torres </Li> <Li> Eric Dane as Dr. Mark Sloan (Until Episode 2) </Li> <Li> Kevin McKidd as Dr. Owen Hunt </Li> <Li> Jessica Capshaw as Dr. Arizona Robbins </Li> <Li> Sarah Drew as Dr. April Kepner </Li> <Li> Jesse Williams as Dr. Jackson Avery </Li> <Li> Patrick Dempsey as Dr. Derek Shepherd </Li> </Ul> <Li> Ellen Pompeo as Dr. Meredith Grey </Li> <Li> Sandra Oh as Dr. Cristina Yang </Li> <Li> Justin Chambers as Dr. Alex Karev </Li>

When does jo find out she's pregnant