<Tr> <Th_colspan="2"> Mark Sloan </Th> </Tr> <Tr> <Td_colspan="2"> Grey's Anatomy character </Td> </Tr> <Tr> <Td_colspan="2"> Eric Dane as Mark Sloan </Td> </Tr> <Tr> <Th> First appearance </Th> <Td> "Yesterday" 2x18, February 19, 2006 (as guest star) "Sometimes a Fantasy" 3x03, October 5, 2006 (as main cast) </Td> </Tr>

When is sophia born in grey's anatomy