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The Big Bang Theory

Timeline of Events that Happened in the Fourth Season

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Timeline
This chronology is a timeline of events that happened during the Fourth Season, approximately July, 2010 to June, 2011.

Timeline Section heading

July 2010 Jim Lee sketches Leonard at ComicCon The Good Guy Fluctuation

64. “The Robotic Manipulation”

September 23, 2010 – Howard introduces the robot hand

September 24, 2010 – Sheldon & Amy’s date, Howard at the emergency room

65. “The Cruciferous Vegetable Amplification”

Thursday, September 30, 2010 – Sheldon discusses the singularity

October 1, 2010 – Sheldon & Penny go jogging

October 2, 2010 – Sheldon introduces the mobile presence device

October 3, 2010 – Sheldon sees Steve Wozniak 

October 4, 2010 – Penny sings soft kitty to the MPD

66. “The Zazzy Substitution”

October 5, 2010 – Amy meets Penny

October 6, 2010 – the guys meet at Penny’s apartment 

October 7, 2010 – Sheldon & Amy break –up

October 9, 2010 – Sheldon & Penny talk in the laundry room

October 10, 2010 – Sheldon buys cats

October 11, 2010 – Sheldon’s Mom arrives

October 12, 2010= Sheldon & Amy pay people to take cats

67. “The Hot Troll Derivation”

Tuesday October 12, 2010 – Howard sees Bernadette at the Cheesecake Factory

October 13, 2010 – Sheldon lets Raj buy desk, Howard talks to Penny about getting back together with Bernadette

October 14, 2010 – Raj moves in desk, Howard & Bernadette  meet

October 15, 2010 – Sheldon & Raj’s war 

October 16, 2010 – Howard and Bernadette neck in the car

October 17, 2010 – Sheldon wears a gas mask

68. “The Desperation Emanation”

October 21, 2010 – Leonard is lonely, Sheldon asked to meet Amy’s mom 

October 22, 2010 – Leonard invokes girlfriend pact with Howard

October 23, 2010 – Leonard’s’ date with Joy

October 24, 2010 – Sheldon meets Amy’s mom 

69. “The Irish Pub Formulation”

October 26, 2010 – Priya arrives

October 27, 2010 – lunch discussion about Priya

October 28, 2010 – insect sno-cones

70. “The Apology Insuffiency”

November 4, 2010 – Howard announces he’s applying for a security clearance

November 5, 2010 – Agent Page visits Raj, Leonard & Sheldon 

November 6, 2010 – Howard doesn’t get clearance

November 7, 2010 – Sheldon meets Agent Page & Neil de Grasse Tyson 

November 8, 2010 – Sheldon give Howard his spot

71. “The 21 Second Excitation”

November 11, 2010 – Penny watches Raiders of the Lost Ark

Friday Nov 12, 2010 – the guys go to see the film, the girls have a slumber party

Sheldon & Leonard go to the arcade [The Itchy Brain Stimulation]

72. “The Boyfriend Complexity”

November 18, 2010 – Wyatt arrives

November 19, 2010 – Wyatt leaves

At Thanksgiving, 2010 Penny and Zack go to Las Vegas and think they are fake married by an Elvis impersonator, however they really are married [The Thanksgiving Decoupling]

73. “The Alien Parasite Hypothesis”

December 9, 2010 – Amy sees Zack

December 10, 2010 – Zack and Amy meet

74. “The Justice League Recombination”

December 16, 2010 – they are invited to New Year’s Eve party

December 31, 2010 Zack is Superman at the  comic book store party

75. “The Bus Pants Utilization”

January 6, 2011 – Leonard gets the idea for an equation app

January 7, 2011 – Sheldon is fired from the group

76. “The Love Car Displacement”

Tuesday, January 18, 2011 – Penny is  invited to Big Sur conference

January 21, 2011 – they leave for Big Sur

January 22, 2011  – the conference

77. “The Thespian Catalyst”

February 3, 2011 – Sheldon lectures

February 4, 2011 – Sheldon asks Penny for lessons in acting

Saturday, February 5, 2011  – his first lesson

February 6, 2011 – his second lesson

78.  “The Benefactor Factor”

February 10, 2011 – Dr. Seibert tells about a reception  for donors

Saturday, February 12, 2011 – the donors reception

Sunday, February 13, 2011 –Leonard & Mrs. Lambert  date

February 14, 2011 – second Leonard & Mrs Lambert date

February 15, 2011 - Leonard at Cal Tech

79. “The Cohabitation Formulation”

February 17, 2011 – Howard & Bernadette argue and Leonard visits Priya

February 20, 2011 – they eat at the Cheesecake factory 

February 21, 2011 – Howard briefly moves in with Bernadette

February 22, 2011 – Sheldon and Penny share a meal 

80. “The Toast Derivation”

Thursday, February 24, 2011 -  everyone eats at Raj’s 

February 25, 2011 – Sheldon’s new group of friends meet

81. “The Prestidigitation Approximation”

March 10, 2011 – Howard shows card trick                      

March 11, 2011 – Leonard tries to tell Penny to stay away 

March 12, 2011 – Penny interrupts Leonard & Priya’s date at restaurant

March 13, 2011  – Sheldon tries card trick

March 14, 2011 – Sheldon tries card trick

82. “The Zarnecki Incursion”

March 31, 2011 – Sheldon’s world of warcraft account hacked 

April 1, 2011 – they visit the hacker and Penny kicks him in the scrotum

April 2, 2011 – Penny & Priya climb the stairs in silence

83.. “The Herb Garden Germination”

April 7, 2011 – Sheldon and Amy attend a lecture by   Brian Greene 

April 8, 2011 – Sheldon and Leonard play wii archery

April 9, 2011 – rumor that Bernadette is going to dump Howard

April 10, 2011 – Howard says going to propose, Sheldon and Amy start rumor

April 11, 2011 – Howard proposes to Bernadette and she accepts

April, 2011 Penny gets a call back on hemorrhoid commercial [The Skank Reflex]

84. “The Agreement Dissection”      

April 28, 2011 - Sheldon’s bathroom emergency & dancing night

April 29, 2011 Sheldon blackmails Priya and Leonard                                      

85. “The Wildebeest Implementation”

May 5, 2011 – Sheldon invents 3 handed chess and dinner of Leonard, Priya, Howard & Bernadette 

86. “The Engagement Reaction”

May 12, 2011 – Howard and Bernadette asked about wedding plans

May 13, 2011 – Howard’s Mom and Bernadette have lunch, Mrs. Wolowitz in hospital

May 28, 2011 - 2 weeks later it is the end of Sheldon’s quarantine

87. “The Roommate Transmogrification”

June 2, 2011 – Bernadette gets her Doctorate

June 3, 2011 – Raj moves in with Sheldon, Leonard learns Priya is moving back to India

June 4, 2011 – Raj & Penny emerge from Leonard’s bedroom 

Notes

It is presumed that all episodes begin on the date they were first aired in the United States.

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