<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> Prod . code </Th> <Th> U.S. viewers ( millions ) </Th> </Tr> <Tr> <Th> 45 </Th> <Td> </Td> <Td> `` The Birthday '' </Td> <Td> John Behring </Td> <Td> Kevin Williamson & Julie Plec </Td> <Td> September 15 , 2011 ( 2011 - 09 - 15 ) </Td> <Td> 2J6001 </Td> <Td> 3.10 </Td> </Tr> <Tr> <Td colspan="8"> Elena 's eighteenth birthday arrives and Caroline holds a party . Klaus and Stefan hunt for werewolves so Klaus can create more hybrids . Stefan returns home to warn Damon to stop tracking them by killing Andie . Stefan later calls Elena , but does n't say anything and she promises she will find him . Jeremy continues to see Vicki and Anna 's ghosts . Alaric moves out . Caroline is jealous when Tyler brings a date to the party , and the two end up sleeping together . As Caroline leaves , Carol shoots her . </Td> </Tr> <Tr> <Th> 46 </Th> <Td> </Td> <Td> `` The Hybrid '' </Td> <Td> Joshua Butler </Td> <Td> Al Septien & Turi Meyer </Td> <Td> September 22 , 2011 ( 2011 - 09 - 22 ) </Td> <Td> 2J6002 </Td> <Td> 2.52 </Td> </Tr> <Tr> <Td colspan="8"> Elena and Alaric head to Tennessee and are followed by Damon . Klaus continues to try to create hybrids but fails when the hybrids end up bleeding to death or went crazy and Klaus had to kill them himself . Apparently so because Elena is still alive . Stefan meets up with Damon and tells him to protect Elena . Damon tells Elena that he 's wrong about his brother and that Stefan can still be saved . Matt tries to connect with Vicki 's ghost through Jeremy . Tyler realises his mother had captured Caroline , who is still being held captive . Tyler then shows his mother he 's a werewolf as it was a full moon that night , showing that he was also a monster . Bill , Caroline 's dad goes to see Caroline . </Td> </Tr> <Tr> <Th> 47 </Th> <Td> </Td> <Td> `` The End of the Affair '' </Td> <Td> Chris Grismer </Td> <Td> Caroline Dries </Td> <Td> September 29 , 2011 ( 2011 - 09 - 29 ) </Td> <Td> 2J6003 </Td> <Td> 2.74 </Td> </Tr> <Tr> <Td colspan="8"> Klaus and Stefan arrive in Chicago , where they knew each other during one of Stefan 's previous periods as a Ripper in the 1920s . It is revealed that Klaus knew Stefan in the 1920s . Stefan met Klaus and Rebekah in a bar where they became close . Klaus and Rebekah had to leave and Klaus compelled Stefan to forget them . Klaus then daggers Rebekah . In present day , he removes the dagger keeping her demobilized as she has what Gloria ( a powerful witch ) needs to help Klaus create hybrids . It is revealed that what Gloria needs is the necklace Stefan had given Elena . Damon gets a tip on Stefan and Klaus ' whereabouts from Katherine so he and Elena follow the trail . They go to Stefan 's old apartment , where Elena sees Stefan 's list of victims . While there , Stefan and Klaus arrive . Stefan sees Elena , however does n't tell Klaus. Tyler tries to rescue Caroline , who is being tortured by her father , who believes he can change her urge to feed on blood by burning her in sunlight every time she feels the urge . </Td> </Tr> <Tr> <Th> 48 </Th> <Td> </Td> <Td> `` Disturbing Behavior '' </Td> <Td> Wendey Stanzler </Td> <Td> Brian Young </Td> <Td> October 6 , 2011 ( 2011 - 10 - 06 ) </Td> <Td> 2J6004 </Td> <Td> 2.63 </Td> </Tr> <Tr> <Td colspan="8"> In Chicago , Klaus uses Gloria the witch to find out why his hybrids are n't turning out the way he planned and Gloria discovers that Stefan is hiding the fact that the doppelgänger is still alive . She tortures Stefan , but Katherine saves him . Back in Mystic Falls , Damon changes his attitude and kills Alaric but Alaric comes back to life . Damon then tries to kill Bill . Caroline saves her father by giving him her blood and has a confrontation with Damon . Meanwhile , Bonnie returns to Mystic Falls and Jeremy tells her about seeing his ex-girlfriends as ghosts . Stefan also tries to find out what Klaus and his sister Rebekah are running from . The answer turns out to be Mikael .
<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> Prod . code </Th> <Th> U.S. viewers ( millions ) </Th> </Tr> <Tr> <Th> 45 </Th> <Td> </Td> <Td> `` The Birthday '' </Td> <Td> John Behring </Td> <Td> Kevin Williamson & Julie Plec </Td> <Td> September 15 , 2011 ( 2011 - 09 - 15 ) </Td> <Td> 2J6001 </Td> <Td> 3.10 </Td> </Tr> <Tr> <Td colspan="8"> Elena 's eighteenth birthday arrives and Caroline holds a party . Klaus and Stefan hunt for werewolves so Klaus can create more hybrids . Stefan returns home to warn Damon to stop tracking them by killing Andie . Stefan later calls Elena , but does n't say anything and she promises she will find him . Jeremy continues to see Vicki and Anna 's ghosts . Alaric moves out . Caroline is jealous when Tyler brings a date to the party , and the two end up sleeping together . As Caroline leaves , Carol shoots her . </Td> </Tr> <Tr> <Th> 46 </Th> <Td> </Td> <Td> `` The Hybrid '' </Td> <Td> Joshua Butler </Td> <Td> Al Septien & Turi Meyer </Td> <Td> September 22 , 2011 ( 2011 - 09 - 22 ) </Td> <Td> 2J6002 </Td> <Td> 2.52 </Td> </Tr> <Tr> <Td colspan="8"> Elena and Alaric head to Tennessee and are followed by Damon . Klaus continues to try to create hybrids but fails when the hybrids end up bleeding to death or went crazy and Klaus had to kill them himself . Apparently so because Elena is still alive . Stefan meets up with Damon and tells him to protect Elena . Damon tells Elena that he 's wrong about his brother and that Stefan can still be saved . Matt tries to connect with Vicki 's ghost through Jeremy . Tyler realises his mother had captured Caroline , who is still being held captive . Tyler then shows his mother he 's a werewolf as it was a full moon that night , showing that he was also a monster . Bill , Caroline 's dad goes to see Caroline . </Td> </Tr> <Tr> <Th> 47 </Th> <Td> </Td> <Td> `` The End of the Affair '' </Td> <Td> Chris Grismer </Td> <Td> Caroline Dries </Td> <Td> September 29 , 2011 ( 2011 - 09 - 29 ) </Td> <Td> 2J6003 </Td> <Td> 2.74 </Td> </Tr> <Tr> <Td colspan="8"> Klaus and Stefan arrive in Chicago , where they knew each other during one of Stefan 's previous periods as a Ripper in the 1920s . It is revealed that Klaus knew Stefan in the 1920s . Stefan met Klaus and Rebekah in a bar where they became close . Klaus and Rebekah had to leave and Klaus compelled Stefan to forget them . Klaus then daggers Rebekah . In present day , he removes the dagger keeping her demobilized as she has what Gloria ( a powerful witch ) needs to help Klaus create hybrids . It is revealed that what Gloria needs is the necklace Stefan had given Elena . Damon gets a tip on Stefan and Klaus ' whereabouts from Katherine so he and Elena follow the trail . They go to Stefan 's old apartment , where Elena sees Stefan 's list of victims . While there , Stefan and Klaus arrive . Stefan sees Elena , however does n't tell Klaus. Tyler tries to rescue Caroline , who is being tortured by her father , who believes he can change her urge to feed on blood by burning her in sunlight every time she feels the urge . </Td> </Tr> <Tr> <Th> 48 </Th> <Td> </Td> <Td> `` Disturbing Behavior '' </Td> <Td> Wendey Stanzler </Td> <Td> Brian Young </Td> <Td> October 6 , 2011 ( 2011 - 10 - 06 ) </Td> <Td> 2J6004 </Td> <Td> 2.63 </Td> </Tr> <Tr> <Td colspan="8"> In Chicago , Klaus uses Gloria the witch to find out why his hybrids are n't turning out the way he planned and Gloria discovers that Stefan is hiding the fact that the doppelgänger is still alive . She tortures Stefan , but Katherine saves him . Back in Mystic Falls , Damon changes his attitude and kills Alaric but Alaric comes back to life . Damon then tries to kill Bill . Caroline saves her father by giving him her blood and has a confrontation with Damon . Meanwhile , Bonnie returns to Mystic Falls and Jeremy tells her about seeing his ex-girlfriends as ghosts . Stefan also tries to find out what Klaus and his sister Rebekah are running from . The answer turns out to be Mikael .
when does stefan come back to mystic falls in season 3
when does stefan come back to mystic falls in season 3
`` Disturbing Behavior ''
`` Disturbing Behavior ''