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The Big Bang Theory

Timeline of the Second Season

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Timeline
This chronology is a timeline of events that happened during the Second Season or approximately May, 2008 to May, 2009

TIMELINE

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18. “The Bad Fish Paradigm

May 24, 2008 Leonard & Penny return from their date

May 31, 2008   Penny confesses to Sheldon that she did not graduate , he  freaks out    about keeping a secret and moves out                         

June 1, 2008 Penny dumps Leonard

September, 2008 Penny’s check engine light comes on [The Euclid Alternative]

19. “The Codpiece Topology”

September 21, 2008 - the boys attend the renaissance fair

September 25, 2008 – Leonard makes a date with Leslie Winkle

Friday, September 26, 2008  – Leonard’s date with Leslie

September 27, 2008 – Leonard & Leslie’s second date & break up

September 28, 2008 – the boys attend the renaissance fair

20. “The Barbarian Sublimation”

October 5, 2008 – Sheldon introduces Penny to Age of Conan

October 6, 2008  – Penny comes in Sheldon’s room

Thursday, October 9, 2008  – Penny calls Sheldon @ work

October 10, 2008 – Sheldon tries to set-up Penny with a guy

October 11, 2008  – Tom shows up, Penny overcomes her addiction

21. “The Griffin Equivalency”

October 13, 2008 – Raj learns about People’s 30 under 30 article

October 14, 2008  – Dr. Gablehouser fawns over Raj

Saturday, October 18, 2008 – Raj takes Penny to the People magazine reception

October 19, 2008 – Raj apologizes to Penny

22. “The Euclid Alternative”

October 20, 2008 – Penny drives Sheldon to work

October 21, 2008 – intervention and a visit to the DMV

October 22, 2008  – Sheldon on the driving simulator

October 23, 2008 – Sheldon lives at Cal Tech

23. “The Cooper-Nowitzki Theorem”

October 26, 2008 – Leonard & Sheldon lecture to undergrads

Monday, October 27, 2008 – Ramona shows up

Wednesday October 29, 2009 -  Ramona get Sheldon’s food & gives pedicure

Saturday, November 1, 2008 – Sheldon does not leave to play paintball, but later tries to sneak off

                                            

November 2, 2008 - Sheldon caught by Ramona with a batman comic

November 3, 2008 everyone except Sheldon plays paintball

November 4, 2008 – Ramona finds Sheldon in shower with a gameboy ,Sheldon seeks sanctuary with Penny

November 5, 2008  – Sheldon’s breakthrough; Ramona leaves

November 6, 2008 – Sheldon meets  Kathy O’Brien, another grad student

24. “The Panty Piñata Polarization”

November 10, 2008 – Howard & Raj learn of the Top Model House

November 11, 2008 – Penny gets three strikes from Sheldon

Saturday, November 15, 2008 they eat at cheesecake factory – Penny ruins laundry night, but Leonard gives Penny Sheldon’s Mom’s telephone number. She makes Sheldon rescind strikes.

November 16, 2008 – Raj & Howard visit the Top Model House

25. “The Lizard-Spock Expansion”

November 17, 2008 - Howard needs help at the Mars rover lab, Leonard meets Stephanie

November 18, 2008  – Leonard & Stephanie on a date

November 19, 2008  – Leonard & Penny talk in the laundry room about Stephanie

November 20, 2008 – Leonard & Howard make up

November 21, 2008 – news of life discovered on Mars

26. “The White Asparagus Triangulation”

November 24, 2008 – Sheldon talks with Penny, then intrudes on Leonard and            Stephanie’s date

November 25, 2008 -  Sheldon intrudes on Leonard and Stephanie’s movie date

November 26, 2008 – Sheldon gives Penny zucchini bread, and Leonard hurt in           Sheldon’s plan to make him appear macho

December 1, 2008 – Sheldon changes Leonard’s facebook status

27. “The Vartabedian Conundrum”

December 8, 2008 – Leonard & Sheldon discuss the roommate agreement cohabitation clause

December 9, 2008 – Penny shows Leonard Stephanie has moved in

December 10, 2008  – Leonard dumps Stephanie

28. “The Bath Item Gift Hypothesis”

December 16, 2008 – the boys meet David Underhill

December 16, 2008  – they do wii bowling 

December 17, 2008 – Penny meets  David

December 18, 2008 – Sheldon shops at Bath & Bodyworks, Leonard is  depressed until    Penny dumps David when she learns he is married

December 25, 2008 – Penny gives Sheldon a napkin signed by Leonard Nimoy 

29. “The Killer Robot Instability”

January 12, 2009 – MONTE complete, Penny insults Howard

January 13, 2009  – Howard is in a funk, they are challenged by Kripke

January 14, 2009 – Penny visits Howard, MONTE destroyed

30. “The Friendship Algorithm”

January 19, 2009 – Sheldon decides to become Kripke’s friend

January 20, 2009 – Sheldon hands out a questionnaire to current friends

January 21, 2009 – Sheldon berates Leonard s answers, trip to bookstore

January 22, 2009 – Sheldon’s flowchart  on how to make a friend

January 23, 2009 – Sheldon goes rock climbing with Kripke

January 24, 2009 – Sheldon tries rock climbing again 

31. “The Financial Permeability”

February 2, 2009 – Sheldon lends money to Penny 

February 3, 2009 – Leonard visits Kurt to collect money he owes Penny

February 4, 2009 – Penny repays Sheldon after Kurt repays her

32. “The Maternal Capacitance”

February 9, 2009 – Leonard learns his Mom will be visiting

February 10, 2009 – his Mom arrives

February 11, 2009 – his Mom visits Cal Tech, Leonard & Penny drink

February 12, 2009  – Leonard’s Mom leaves

33. “The Cushion Saturation”

February 28, 2009 – Howard & Leslie hook up in the paintball shed

March 1, 2009 – Penny shoots the cushion in Sheldon’s spot

March 2, 2009 – at supper Sheldon can’t sit

March 3, 2009 – the cushion returns [error says schezuan palace closed 2 ya, but ate there 1ya ago ]

March 7, 2009 Leslie Winkle’s sister gets married

March 8, 2009 – in paintball Sheldon  shoots Penny in revenge for shooting cushion 

34. “The Terminator Decoupling”

March 9, 2009 – the boys tell Penny about their San Francisco trip

March 10, 2009 -  Sheldon packs

March 11, 2009 – the train trip up the coast

March 12, 2009 – the conference

35. “The Work Song Nanocluster”

March 16, 2009 – Sheldon helps  Penny with her business

March 17, 2009 – she gets a 5000 ‘Penny blossoms’ order & they work al night to make  them

March 18, 2009 – she gets another order for 5000

36. “The Dead Hooker Juxtaposition”

March 30, 2009 – they discuss the tenant of 5A moving out

March 31, 2009 – the boys arrive to help Howard move out of Mom’s house

April 1, 2009 – Alicia moves in to Apartment 5A

April 2, 2009 – Penny buys supper for the guys

April 3, 2009 – the catfight between Penny and Alicia

April 4, 2009 – fight aftermath with Penny’s black eye

mid-April 2009 Raj’s research into the composition of Trans-Neptunian objects reaches a dead-end  [the Pirate Solution]

37. “The Hofstadter Isotope”

Thursday, April 16, 2009  – Penny goes to comic book store to get a birthday gift for her nephew and meets Stuart

Friday, April 17, 2009 – Penny & Stuart go to art show 

38. “The Vegas Renormalization”

April 27, 2009 – Leslie dumps Howard 

April 28, 2009 – Leonard and Raj take Howard to Las Vegas where they buy him a  prostitute 

April 29, 2009 – they return to Pasadena

Raj had sex [per The Spaghetti  Catalyst]

39. “The Classified Materials Turbulence”

May 4, 2009 – Stuart asks Penny out on a date

May 5, 2009 – Stuart talks to Leonard, Stuart’s date w/ Penny, Howard has problems  with the space toilet & they try to fix  

May 6, 2009 – everyone has a Thai meal 

40. “The Monopolar Expedition”

May 11, 2009 – Sheldon gets an e-mail from Dr. Seibert about National Science           Foundation expedition to the magnetic North pole

May 12, 2009 – Leonard, Raj and Howard decide to go with Sheldon

May 13, 2009 – Sheldon asks Penny if they can use the Cheesecake Factory freezer to practice

May 14, 2009 – the freezer test

May 15, 2009 – everyone talks to talk to Dr & Mrs Koothrapali  via webcam

May 16, 2009 Penny says to herself that she wishes Leonard wasn’t going

May ___, 2009 – at MNP

Notes

While it is generally presumed that the first day of an episode is the date it is broadcast, there are exception, as at the start of this season.

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