<Tr> <Td_colspan="7"> <P> Addison (Kate Walsh) arrives with her brother Archer (Grant Show), who has worms in his brain . Cristina learns of Owen's pre-Iraq past and Bailey considers a pediatric surgery fellowship . Izzie enlists the help of the attendings and her fellow residents in a game to boost camaraderie amongst the interns, and George finds out that Sadie is behind with her skills, forcing her to make a decision . Derek and Mark spend the evening reminiscing on their med school days with Addison, Naomi Bennett, and Sam Bennett . </P> This episode begins a crossover with Private Practice that concludes on "Ex-Life". </Td> </Tr> <P> Addison (Kate Walsh) arrives with her brother Archer (Grant Show), who has worms in his brain . Cristina learns of Owen's pre-Iraq past and Bailey considers a pediatric surgery fellowship . Izzie enlists the help of the attendings and her fellow residents in a game to boost camaraderie amongst the interns, and George finds out that Sadie is behind with her skills, forcing her to make a decision . Derek and Mark spend the evening reminiscing on their med school days with Addison, Naomi Bennett, and Sam Bennett . </P> <Tr> <Th> 94 </Th> <Td> 16 </Td> <Td> "An Honest Mistake" </Td> <Td> Randy Zisk </Td> <Td> Peter Nowalk </Td> <Td> February 19, 2009 (2009 - 02 - 19) </Td> <Td> 15.39 </Td> </Tr> <Tr> <Td_colspan="7"> Addison stays to help delivering the baby of one of Derek's patients and Cristina gets into trouble with a senior doctor . Callie is being called a baby and Bailey has trouble getting a decent letter of recommendation from the chief . Izzie gets the news about her false test - result and investigates the matter further . Mark tells Derek about his seeing Lexie . </Td> </Tr>

Season 5 of grey's anatomy full episodes