<Tr> <Th_colspan="2"> Alex Karev </Th> </Tr> <Tr> <Td_colspan="2"> Grey's Anatomy character </Td> </Tr> <Tr> <Td_colspan="2"> The season nine promotional photograph of Justin Chambers as Dr. Alex Karev </Td> </Tr> <Tr> <Th> First appearance </Th> <Td> "A Hard Day's Night" (1.01) March 27, 2005 </Td> </Tr>

When does alex karev become head of peds