<Table> <Tr> <Th> No . overall </Th> <Th> No. in season </Th> <Th> Title </Th> <Th> Directed by </Th> <Th> Written by </Th> <Th> Original air date </Th> <Th> U.S. viewers ( millions ) </Th> </Tr> <Tr> <Th> 37 </Th> <Td> </Td> <Td> `` Time Has Come Today '' </Td> <Td> Daniel Minahan </Td> <Td> Shonda Rhimes </Td> <Td> September 21 , 2006 ( 2006 - 09 - 21 ) </Td> <Td> 25.41 </Td> </Tr> <Tr> <Td colspan="7"> The interns of Seattle Grace Hospital help Izzie cope with the loss of her fiancé , Denny Duquette as well as her decision to quit the internship program . Meredith is uncertain what the future holds after she has sex with Derek and whether he is willing to leave Addison after a marriage of eleven years . Addison finds Meredith 's panties in Derek 's tux pocket , and realizes that he slept with Meredith . After spending the night in his office , Webber is confronted by his wife , Adele ( Loretta Devine ) . She gives him an ultimatum , forcing him to decide between his career and his marriage . Addison and Alex treat a newborn baby who was found abandoned in a trash can , and they are faced with four minors who could be the mother . George seeks relationship advice from Derek after they are forced to stay under quarantine in the locker room , when Derek confesses his feeling towards Meredith . Bailey gets attached to a patient in isolation whose wife dies , and relives the moments when her husband 's life was threatened . </Td> </Tr> <Tr> <Th> 38 </Th> <Td> </Td> <Td> `` I Am a Tree '' </Td> <Td> Jeff Melman </Td> <Td> Krista Vernoff </Td> <Td> September 28 , 2006 ( 2006 - 09 - 28 ) </Td> <Td> 23.48 </Td> </Tr> <Tr> <Td colspan="7"> Cristina makes a bad first impression on Burke 's parents and is also surprised to find that he is a `` mama 's boy '' . Burke 's mother believes that Cristina is too selfish and driven for her son , and is only trying to take advantage of his extensive knowledge of cardiothoracic surgery . Izzie uses baking to cope with her grieving , and bakes hundreds of muffins . After pinning Meredith 's panties to a bulletin board , Addison takes a day off from the hospital and spends the day drinking . Due to Addison taking the day off , Bailey has Alex help her in the pit , and they 're faced with a teenage patient who has been impaled on a tree branch . A brain tumor patient quizzes Meredith and Cristina over their respective relationships . Webber discovers that Callie has been living in the hospital and tells her she has to leave because of hospital policy . Bailey finds the panties on the bulletin board and loses it , demanding to know who they belong to . Callie sees Meredith 's embarrassment and takes the blame , which in turn causes George to become jealous , fearing Callie might have cheated on him . A surgical patient lives what may be her last day to the fullest . Meredith must choose between Derek and Finn , and struggles coming to a decision . In the end she tells them both that she would like to try dating them both instead . </Td> </Tr> <Tr> <Th> 39 </Th> <Td> </Td> <Td> `` Sometimes a Fantasy '' </Td> <Td> Adam Arkin </Td> <Td> Debora Cahn </Td> <Td> October 5 , 2006 ( 2006 - 10 - 05 ) </Td> <Td> 22.80 </Td> </Tr> <Tr> <Td colspan="7"> Cristina is determined to help Burke overcome his hand tremor and get back into the operating room . Izzie attempts to return to the hospital for the first time since she left the program , but ends up standing in front of the hospital all day , unable to go in and confront Webber . Alex treats a young patient who has a long history of injuries , leading him to suspect abuse . It is discovered that she ca n't feel pain which makes her believe she is a super hero . Derek and Cristina treat a man who elects to have brain surgery so he is able to look after his child . George gets annoyed at Callie after she moves in with him , resulting in them arguing over a patient . Meredith gets annoyed as both Derek and Finn interrupt the other as they are dating her . Mark is determined to get back together with Addison , but she continuously refuses him . </Td> </Tr> <Tr> <Th> 40 </Th> <Td> </Td> <Td> `` What I Am '' </Td>
<Table> <Tr> <Th> No . overall </Th> <Th> No. in season </Th> <Th> Title </Th> <Th> Directed by </Th> <Th> Written by </Th> <Th> Original air date </Th> <Th> U.S. viewers ( millions ) </Th> </Tr> <Tr> <Th> 37 </Th> <Td> </Td> <Td> `` Time Has Come Today '' </Td> <Td> Daniel Minahan </Td> <Td> Shonda Rhimes </Td> <Td> September 21 , 2006 ( 2006 - 09 - 21 ) </Td> <Td> 25.41 </Td> </Tr> <Tr> <Td colspan="7"> The interns of Seattle Grace Hospital help Izzie cope with the loss of her fiancé , Denny Duquette as well as her decision to quit the internship program . Meredith is uncertain what the future holds after she has sex with Derek and whether he is willing to leave Addison after a marriage of eleven years . Addison finds Meredith 's panties in Derek 's tux pocket , and realizes that he slept with Meredith . After spending the night in his office , Webber is confronted by his wife , Adele ( Loretta Devine ) . She gives him an ultimatum , forcing him to decide between his career and his marriage . Addison and Alex treat a newborn baby who was found abandoned in a trash can , and they are faced with four minors who could be the mother . George seeks relationship advice from Derek after they are forced to stay under quarantine in the locker room , when Derek confesses his feeling towards Meredith . Bailey gets attached to a patient in isolation whose wife dies , and relives the moments when her husband 's life was threatened . </Td> </Tr> <Tr> <Th> 38 </Th> <Td> </Td> <Td> `` I Am a Tree '' </Td> <Td> Jeff Melman </Td> <Td> Krista Vernoff </Td> <Td> September 28 , 2006 ( 2006 - 09 - 28 ) </Td> <Td> 23.48 </Td> </Tr> <Tr> <Td colspan="7"> Cristina makes a bad first impression on Burke 's parents and is also surprised to find that he is a `` mama 's boy '' . Burke 's mother believes that Cristina is too selfish and driven for her son , and is only trying to take advantage of his extensive knowledge of cardiothoracic surgery . Izzie uses baking to cope with her grieving , and bakes hundreds of muffins . After pinning Meredith 's panties to a bulletin board , Addison takes a day off from the hospital and spends the day drinking . Due to Addison taking the day off , Bailey has Alex help her in the pit , and they 're faced with a teenage patient who has been impaled on a tree branch . A brain tumor patient quizzes Meredith and Cristina over their respective relationships . Webber discovers that Callie has been living in the hospital and tells her she has to leave because of hospital policy . Bailey finds the panties on the bulletin board and loses it , demanding to know who they belong to . Callie sees Meredith 's embarrassment and takes the blame , which in turn causes George to become jealous , fearing Callie might have cheated on him . A surgical patient lives what may be her last day to the fullest . Meredith must choose between Derek and Finn , and struggles coming to a decision . In the end she tells them both that she would like to try dating them both instead . </Td> </Tr> <Tr> <Th> 39 </Th> <Td> </Td> <Td> `` Sometimes a Fantasy '' </Td> <Td> Adam Arkin </Td> <Td> Debora Cahn </Td> <Td> October 5 , 2006 ( 2006 - 10 - 05 ) </Td> <Td> 22.80 </Td> </Tr> <Tr> <Td colspan="7"> Cristina is determined to help Burke overcome his hand tremor and get back into the operating room . Izzie attempts to return to the hospital for the first time since she left the program , but ends up standing in front of the hospital all day , unable to go in and confront Webber . Alex treats a young patient who has a long history of injuries , leading him to suspect abuse . It is discovered that she ca n't feel pain which makes her believe she is a super hero . Derek and Cristina treat a man who elects to have brain surgery so he is able to look after his child . George gets annoyed at Callie after she moves in with him , resulting in them arguing over a patient . Meredith gets annoyed as both Derek and Finn interrupt the other as they are dating her . Mark is determined to get back together with Addison , but she continuously refuses him . </Td> </Tr> <Tr> <Th> 40 </Th> <Td> </Td> <Td> `` What I Am '' </Td>
when does meredith and derek get back together in season 3
when does meredith and derek get back together in season 3
What I Am
What I Am