Howard and Raj make it their mission to figure out where Sheldon is headed on The Big Bang Theory. "The 43rd Peculiarity" is the eighth episode of the show's sixth season.
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Wolowitz and Bernadette celebrate Halloween by dressing up as Smurfs on The Big Bang Theory. "Holographic Excitation" is the fifth episode of the show's sixth season.
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Wolowitz is caught in an argument between his mother and Bernadette when The Big Bang Theory kicks off Season 6.
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Howard finds out he must reschedule his wedding on this episode of The Big Band Theory. "The Launch Acceleration" is the 23rd installment of the show's 5th season.
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The men of The Big Bang Theory do their thing in this shot from the sitcom. It's courtesy of the episode "The Shiny Trinket Maneuver."
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The boys are concerned about Raj here, but all we be okay. He meets a girl he can actually talk to on "The Wiggly Finger Catalyst."
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The gang is all here. And we mean everyone! Check out this scene from the fifth season premiere of The Big Bang Theory.
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This is awkward for everyone. Raj and Penny stand in front of the boys on the fifth season premiere.
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Howard and Bernadette are seen here during a scene fromThe Big Bang Theory. The photo is courtesy of the episode "The Herb Garden Germination."
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The men have a mission on the episode "The Zarnecki Incursion." They must find the person who hacked into Sheldon's online game account.
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That's Katee Sackhoff and that's George Takei. Both guest star as themselves on the episode "The Hot Troll Deviation."
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Science pays off for Wolowitz on the season four premiere. He gets some solid use out of his robotic arm.
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TBBT Quotes

Penny: Hey, Sheldon, did you change your Wi-Fi password again?
Sheldon: Yes, it's "Penny, get your own Wi-Fi." No spaces.

Sheldon: Why do people cry at weddings?
Mary: They're practicing for what's coming later.