Watch The Big Bang Theory Season 12 full episodes online, free and paid options via our partners and affiliates.

Comforting Amy - The Big Bang Theory
Watch The Big Bang Theory Season 12 Episode 19
"The Inspiration Deprivation"
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On The Big Bang Theory Season 12 Episode 19, what it would mean for women everywhere if Amy were to win a Nobel Prize causes Amy to have a meltdown.

Watching The Competitors - The Big Bang Theory
Watch The Big Bang Theory Season 12 Episode 18
"The Laureate Accumulation"
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On The Big Bang Theory Season 12 Episode 18, Sheldon and Amy try to bring Nobel laureates Kip Thorne, George Smoot and Frances Arnold to their side.

Experimenting On The Kids - The Big Bang Theory
Watch The Big Bang Theory Season 12 Episode 17
"The Conference Valuation"
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On The Big Bang Theory Season 12 Episode 17, with Wolowitz watching the kids, Sheldon finds a book on experimenting on kids, and the gang makes a day of it.

Celebrity Dungeons and Dragons - The Big Bang Theory
Watch The Big Bang Theory Season 12 Episode 16
"The D & D Vortex"
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On The Big Bang Theory Season 12 Episode 16, the gang uses deception and betrayal to get the one open seat at Wil Wheaton's Celebrity Dungeons and Dragons game.

Leonard's Donation - The Big Bang Theory
Watch The Big Bang Theory Season 12 Episode 15
"The Donation Oscillation"
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On The Big Bang Theory Season 12 Episode 15, Penny tries to seduce an abstaining Leonard to ruin his "donation" for her ex-boyfriend and his wife.

Breaking the Law - The Big Bang Theory
Watch The Big Bang Theory Season 12 Episode 14
"The Meteorite Manifestation"
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On The Big Bang Theory Season 12 Episode 14, Leonard is disappointed when he's excluded from a project and Bernadette and Wolowitz may be breaking the law.

Kicking Off Amy - The Big Bang Theory
Watch The Big Bang Theory Season 12 Episode 13
"The Confirmation Polarization"
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On The Big Bang Theory Season 12 Episode 13, Sheldon and Amy's super asymmetry theory is proven by two physicists who try to kick Amy off the Nobel nomination.

Mending Their Relationship - The Big Bang Theory
Watch The Big Bang Theory Season 12 Episode 12
"The Propagation Proposition"
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On The Big Bang Theory Season 12 Episode 12, Koothrappali tries to mend things with his ex-fiancée, Anu and Penny's ex-boyfriend, Zack, asks for Leonard's help.

Jealousy - The Big Bang Theory
Watch The Big Bang Theory Season 12 Episode 11
"The Paintball Scattering"
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On The Big Bang Theory Season 12 Episode 11, Penny and Leonard organize a paintball game that results in mayhem while Sheldon is jealous of Amy.

The Magic Castle - The Big Bang Theory
Watch The Big Bang Theory Season 12 Episode 10
"The VCR Illumination"
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On The Big Bang Theory Season 12 Episode 10, Bernadette helps Wolowitz ace his Magic Castle audition and Sheldon finds a VHS tape from his past.

Amy and Sheldon Are Devastated - The Big Bang Theory
Watch The Big Bang Theory Season 12 Episode 9
"The Citation Negation"
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On The Big Bang Theory Season 12 Episode 9, Sheldon and Amy are devastated after learning that Super-Asymmetry has already been discovered and disproven.

Bonding - The Big Bang Theory
Watch The Big Bang Theory Season 12 Episode 8
"The Consummation Deviation"
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On The Big Bang Theory Season 12 Episode 8, when Wolowitz lures Mr. Fowler away with magic tricks, Sheldon has no choice but to bond Amy's mother.

Looking For a Hideaway - The Big Bang Theory
Watch The Big Bang Theory Season 12 Episode 7
"The Grant Allocation Derivation"
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On The Big Bang Theory Season 12 Episode 7, Bernadette turns the backyard playhouse into aher own hideaway, while Leonard distributes extra grant money.

Halloween Competition - The Big Bang Theory
Watch The Big Bang Theory Season 12 Episode 6
"The Imitation Perturbation"
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On The Big Bang Theory Season 12 Episode 6, Sheldon seeks retaliation at Leonard and Penny's Halloween party when Wolowitz dresses to look like him.

Career Sabotage
Watch The Big Bang Theory Season 12 Episode 5
"The Planetarium Collision"
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On The Big Bang Theory Season 12 Episode 5, Sheldon wants to ensure Amy is available to work with him and accidentally sabotages her career in the process.

Taking Out Anu - The Big Bang Theory
Watch The Big Bang Theory Season 12 Episode 4
"The Tam Turbulence"
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On The Big Bang Theory Season 12 Episode 4, Bernadette and Penny take out Anu and Sheldon won't say why he's never mentioned Tam, his childhood best friend.

Arranging Marriage - The Big Bang Theory
Watch The Big Bang Theory Season 12 Episode 3
"The Procreation Calculation"
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On The Big Bang Theory Season 12 Episode 3, Raj explores an arranged marriage, while Penny and Leonard talk about starting a family

The Perfect Gift - The Big Bang Theory
Watch The Big Bang Theory Season 12 Episode 2
"The Wedding Gift Wormhole"
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On The Big Bang Theory Season 12 Episode 2, Sheldon and Amy make themselves crazy figuring out what the "perfect gift" is that Leonard and Penny gave them.

Making Plans - The Big Bang Theory
Watch The Big Bang Theory Season 12 Episode 1
"The Conjugal Configuration"
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On The Big Bang Theory Season 12 Episode 1, Sheldon and Amy's honeymoon plans fall apart, and they have to make a big decision about the future.