<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> US viewers ( millions ) </Th> </Tr> <Tr> <Th> 41 </Th> <Td> </Td> <Td> `` The Electric Can Opener Fluctuation '' </Td> <Td> Mark Cendrowski </Td> <Td> Steven Molaro </Td> <Td> September 21 , 2009 ( 2009 - 09 - 21 ) </Td> <Td> 3X5551 </Td> <Td> 12.96 </Td> </Tr> <Tr> <Td colspan="8"> <P> When the men return home from their expedition at the Magnetic North Pole , Penny reveals her feelings for Leonard and kisses him when he visits her . Both are interrupted when Sheldon is humiliated on learning that Leonard , Howard and Raj tampered with one of his experiments , and retreats to his mother 's home in Galveston , Texas . When Leonard arrives in Texas , it is Mary who convinces Sheldon to forgive him by disagreeing with his views on evolution . Leonard and Penny then finally have sex , but concede that things are now weird between them . </P> Title reference : The electric can opener used by the men to fake the results of Sheldon 's experiment while at the Magnetic North Pole . </Td> </Tr> <Tr> <Th> 42 </Th> <Td> </Td> <Td> `` The Jiminy Conjecture '' </Td> <Td> Mark Cendrowski </Td> <Td> Jim Reynolds </Td> <Td> September 28 , 2009 ( 2009 - 09 - 28 ) </Td> <Td> 3X5552 </Td> <Td> 13.27 </Td> </Tr> <Tr> <Td colspan="8"> <P> Leonard and Penny vacillate between friendship and a romantic relationship , struggling to resolve the awkwardness . In an attempt to feel comfortable and talk about a solution , they end up getting drunk in her apartment and throwing up all night . Sheldon and Howard stake their most valuable comic books on a bet over the species of a cricket they hear , enlisting a depressed entomologist to settle the bet . After Sheldon loses the bet , he meets Penny and after talking to her about Leonard , assures her that she and Leonard can always go back to being friends . After she explains this to Leonard , the two agree to do so , but they find that neither wants to and have sex again . </P> Title reference : Sheldon tries to guess the species of a cricket he names after Jiminy Cricket . </Td> </Tr> <Tr> <Th> 43 </Th> <Td> </Td> <Td> `` The Gothowitz Deviation '' </Td> <Td> Mark Cendrowski </Td> <Td> Story by : Lee Aronsohn & Richard Rosenstock Teleplay by : Bill Prady & Maria Ferrari </Td> <Td> October 5 , 2009 ( 2009 - 10 - 05 ) </Td> <Td> 3X5553 </Td> <Td> 12.52 </Td> </Tr> <Tr> <Td colspan="8"> <P> Penny 's bed in her apartment breaks , forcing her to sleep at Leonard and Sheldon 's apartment for a few days . Sheldon tries to condition Penny , rewarding with chocolate what he considers to be `` correct '' behavior . Howard and Raj pretend to be goths to try to meet girls at a goth club , but chicken out when the girls persuade them to get tattoos . </P> Title reference : Howard and Raj go to a Goth club . </Td> </Tr> <Tr> <Th> 44 </Th> <Td> </Td> <Td> `` The Pirate Solution '' </Td> <Td> Mark Cendrowski </Td> <Td> Steve Holland </Td> <Td> October 12 , 2009 ( 2009 - 10 - 12 ) </Td> <Td> 3X5554 </Td> <Td> 13.07 </Td> </Tr> <Tr> <Td colspan="8"> <P> Raj 's research on trans - Neptunian objects comes to a dead end and he faces deportation to India unless he gets a new job . Sheldon offers Raj a chance to work for him . Raj accepts but disagreements ensue . Eventually , Sheldon apologises to Raj , conceding that his theory is correct but refusing to give up on his own . Howard tries to hang out with Leonard and Penny , but intrudes into their relationship . </P> Title reference : Sheldon 's comment about Raj either emigrating to another country , returning to India , or `` wandering the high seas as a stateless pirate . '' </Td> </Tr> <Tr> <Th> 45 </Th> <Td> 5 </Td> <Td> `` The Creepy Candy Coating Corollary '' </Td> <Td> Mark Cendrowski </Td> <Td> Story by : Chuck Lorre & Bill Prady Teleplay by : Lee Aronsohn & Steven Molaro </Td> <Td> October 19 , 2009 ( 2009 - 10 - 19 ) </Td> <Td> 3X5556 </Td> <Td> 13.47 </Td> </Tr> <Tr> <Td colspan="8"> <P> Howard reminds Leonard of their girlfriend pact : one of the two men ( Leonard ) who has a
<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> US viewers ( millions ) </Th> </Tr> <Tr> <Th> 41 </Th> <Td> </Td> <Td> `` The Electric Can Opener Fluctuation '' </Td> <Td> Mark Cendrowski </Td> <Td> Steven Molaro </Td> <Td> September 21 , 2009 ( 2009 - 09 - 21 ) </Td> <Td> 3X5551 </Td> <Td> 12.96 </Td> </Tr> <Tr> <Td colspan="8"> <P> When the men return home from their expedition at the Magnetic North Pole , Penny reveals her feelings for Leonard and kisses him when he visits her . Both are interrupted when Sheldon is humiliated on learning that Leonard , Howard and Raj tampered with one of his experiments , and retreats to his mother 's home in Galveston , Texas . When Leonard arrives in Texas , it is Mary who convinces Sheldon to forgive him by disagreeing with his views on evolution . Leonard and Penny then finally have sex , but concede that things are now weird between them . </P> Title reference : The electric can opener used by the men to fake the results of Sheldon 's experiment while at the Magnetic North Pole . </Td> </Tr> <Tr> <Th> 42 </Th> <Td> </Td> <Td> `` The Jiminy Conjecture '' </Td> <Td> Mark Cendrowski </Td> <Td> Jim Reynolds </Td> <Td> September 28 , 2009 ( 2009 - 09 - 28 ) </Td> <Td> 3X5552 </Td> <Td> 13.27 </Td> </Tr> <Tr> <Td colspan="8"> <P> Leonard and Penny vacillate between friendship and a romantic relationship , struggling to resolve the awkwardness . In an attempt to feel comfortable and talk about a solution , they end up getting drunk in her apartment and throwing up all night . Sheldon and Howard stake their most valuable comic books on a bet over the species of a cricket they hear , enlisting a depressed entomologist to settle the bet . After Sheldon loses the bet , he meets Penny and after talking to her about Leonard , assures her that she and Leonard can always go back to being friends . After she explains this to Leonard , the two agree to do so , but they find that neither wants to and have sex again . </P> Title reference : Sheldon tries to guess the species of a cricket he names after Jiminy Cricket . </Td> </Tr> <Tr> <Th> 43 </Th> <Td> </Td> <Td> `` The Gothowitz Deviation '' </Td> <Td> Mark Cendrowski </Td> <Td> Story by : Lee Aronsohn & Richard Rosenstock Teleplay by : Bill Prady & Maria Ferrari </Td> <Td> October 5 , 2009 ( 2009 - 10 - 05 ) </Td> <Td> 3X5553 </Td> <Td> 12.52 </Td> </Tr> <Tr> <Td colspan="8"> <P> Penny 's bed in her apartment breaks , forcing her to sleep at Leonard and Sheldon 's apartment for a few days . Sheldon tries to condition Penny , rewarding with chocolate what he considers to be `` correct '' behavior . Howard and Raj pretend to be goths to try to meet girls at a goth club , but chicken out when the girls persuade them to get tattoos . </P> Title reference : Howard and Raj go to a Goth club . </Td> </Tr> <Tr> <Th> 44 </Th> <Td> </Td> <Td> `` The Pirate Solution '' </Td> <Td> Mark Cendrowski </Td> <Td> Steve Holland </Td> <Td> October 12 , 2009 ( 2009 - 10 - 12 ) </Td> <Td> 3X5554 </Td> <Td> 13.07 </Td> </Tr> <Tr> <Td colspan="8"> <P> Raj 's research on trans - Neptunian objects comes to a dead end and he faces deportation to India unless he gets a new job . Sheldon offers Raj a chance to work for him . Raj accepts but disagreements ensue . Eventually , Sheldon apologises to Raj , conceding that his theory is correct but refusing to give up on his own . Howard tries to hang out with Leonard and Penny , but intrudes into their relationship . </P> Title reference : Sheldon 's comment about Raj either emigrating to another country , returning to India , or `` wandering the high seas as a stateless pirate . '' </Td> </Tr> <Tr> <Th> 45 </Th> <Td> 5 </Td> <Td> `` The Creepy Candy Coating Corollary '' </Td> <Td> Mark Cendrowski </Td> <Td> Story by : Chuck Lorre & Bill Prady Teleplay by : Lee Aronsohn & Steven Molaro </Td> <Td> October 19 , 2009 ( 2009 - 10 - 19 ) </Td> <Td> 3X5556 </Td> <Td> 13.47 </Td> </Tr> <Tr> <Td colspan="8"> <P> Howard reminds Leonard of their girlfriend pact : one of the two men ( Leonard ) who has a
when is bernadette introduced in the big bang theory
when is bernadette introduced in the big bang theory
`` The Creepy Candy Coating Corollary ''
`` The Creepy Candy Coating Corollary ''