Watch The Big Bang Theory Season 8 full episodes online, free and paid options via our partners and affiliates.

Decision Time - The Big Bang Theory
Watch The Big Bang Theory Season 8 Episode 24
"The Commitment Determination"
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On The Big Bang Theory Season 8 Episode 24 Sheldon has to deal with serious changes in his own relationship as he pushes Leonard and Penny to set a date.

The Mothers Visit - The Big Bang Theory
Watch The Big Bang Theory Season 8 Episode 23
"The Maternal Combustion"
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On The Big Bang Theory Season 8 Episode 23, Christine Baranski and Laurie Metcalf guest star as Leonard and Sheldon's mothers in "The Maternal Combustion"

Sexy Grads - The Big Bang Theory
Watch The Big Bang Theory Season 8 Episode 22
"The Graduation Transmission"
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On The Big Bang Theory Season 8 Episode 22, it's "The Graduation Transmission" has angry dads, sexy grads and the one suggestions that geniuses never want to hear.

The Message - The Big Bang Theory
Watch The Big Bang Theory Season 8 Episode 21
"The Communication Deterioration"
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On The Big Bang Theory Season 8 Episode 21, when Raj is asked by NASA to craft a message for the extraterrestrials the guys battle over what it should be.

The Fort Test - The Big Bang Theory
Watch The Big Bang Theory Season 8 Episode 20
"The Fortification Implementation"
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On The Big Bang Theory Season 8 Episode 20, Sheldon and Amy come to a serious crossroads in their relationship when they build a blanket fort together.

Ping Pong Battle - The Big Bang Theory
Watch The Big Bang Theory Season 8 Episode 19
"The Skywalker Incursion"
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On The Big Bang Theory Season 8 Episode 19, Raj and Amy offer to settle an argument for Howard and Bernadette with ping pong, and Leonard and Sheldon take a road trip.

The Family Dinner - The Big Bang Theory
Watch The Big Bang Theory Season 8 Episode 18
"The Leftover Thermalization"
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On The Big Bang Theory Season 8 Episode 18, the gang has a final family dinner in Mrs. Wolowitz's honor and Leonard is upset when he fails to get credit for a paper he cowrote with Sheldon.

Going to Mars - The Big Bang Theory
Watch The Big Bang Theory Season 8 Episode 17
"The Colonization Application"
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On The Big Bang Theory Season 8 Episode 17, Amy realizes that Sheldon has applied for a one-way mission to Mars and Leonard shocks Penny with a special purchase.

The Love Experiment - The Big Bang Theory
Watch The Big Bang Theory Season 8 Episode 16
"The Intimacy Acceleration"
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On The Big Bang Theory Season 8 Episode 16, Sheldon and Penny try an experiment designed to make participants fall in love while the rest of the gang tries to escape a zombie.

An Uncanny Resemblance - The Big Bang Theory
Watch The Big Bang Theory Season 8 Episode 15
"The Comic Book Store Regeneration"
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On The Big Bang Theory Season 8 Episode 15, Raj and Leonard run into a restaurant customer who looks a lot like actor Nathan Fillion while Stuart reopens his comic book store.

Embarassing Moments - The Big Bang Theory
Watch The Big Bang Theory Season 8 Episode 14
"The Troll Manifestation"
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On The Big Bang Theory Season 8 Episode 14, Leonard and Sheldon must take on an online bully when they co-publish a paper and the girls remember embarassing moments.

Sheldon's Experiment - The Big Bang Theory
Watch The Big Bang Theory Season 8 Episode 13
"The Anxiety Optimization"
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On The Big Bang Theory Season 8 Episode 13, Sheldon asks all of his friends to challenge him in order to help him make a scientific breakgthrough.

Dress Shopping - The Big Bang Theory
Watch The Big Bang Theory Season 8 Episode 12
"The Space Probe Disintegration"
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On The Big Bang Theory Season 8 Episode 12, Wolowitz tries to help distract Raj as he awaits data from his space probe while Sheldon and Leonard go dress shopping with Penny and Amy.

The Clean Room - The Big Bang Theory
Watch The Big Bang Theory Season 8 Episode 11
"The Clean Room Infiltration"
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On The Big Bang Theory Season 8 Episode 11, a a Scrooge-like Sheldon buys Amy the worst possible gift while Leonard and Howard scramble to remove a pigeon that flew into the clean room.

Fun With Flags - The Big Bang Theory
Watch The Big Bang Theory Season 8 Episode 10
"The Champagne Reflection"
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On The Big Bang Theory Season 8 Episode 10, Sheldon ends up giving a tearful goodby to "Fun with Flags"

Leonard's Surgery - The Big Bang Theory
Watch The Big Bang Theory Season 8 Episode 9
"The Septum Deviation"
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Sheldon ends up needing sympathy when Leonard has minor surgery on his nose on The Big Bang Theory Season 8 Episode 9.

The Prom - The Big Bang Theory
Watch The Big Bang Theory Season 8 Episode 8
"The Prom Equivalency"
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On The Big Bang Theory Season 8 Episode 8, Sheldon is leery as Amy and Bernadette throw a prom on their rooftop. Sheldon and Amy's relationship takes a big leap forward.

Science and Sexuality - The Big Bang Theory Season 8 Episode 7
Watch The Big Bang Theory Season 8 Episode 7
"The Misinterpretation Agitation"
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On The Big Bang Theory Season 8 Episode 7, the guys try to help Penny deal with a smitten doctor after she gives a flirtatious sales pitch.

The Steam Tunnel - The Big Bang Theory
Watch The Big Bang Theory Season 8 Episode 6
"The Expedition Approximation"
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Sheldon and Raj end up taking an experimental expedition into a steam tunnel on The Big Bang Theory.

New Ways to Procrastinate - The Big Bang Theory
Watch The Big Bang Theory Season 8 Episode 5
"The Focus Attentuation"
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The guys end up with new ways to procrastinate when they look for a way to come up with something cool on The Big Bang Theory.

The Cold Shoulder - The Big Bang Theory
Watch The Big Bang Theory Season 8 Episode 4
"The Hook-Up Reverberation"
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Raj regrets being so open about his past when his girlfriend gives Penny the cold shoulder on The Big Bang Theory.

The Nervous Pitch - The Big Bang Theory
Watch The Big Bang Theory Season 8 Episode 3
"The First Pitch Insufficiency"
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On The Big Bang Theory, the gang supports Howard as he prepares to throw the first pitch at an Angels game and Sheldon thinks his relationship is superior to Leonard's.

Sheldon's Class - The Big Bang Theory
Watch The Big Bang Theory Season 8 Episode 2
"The Junior Professor Solution"
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When Sheldon must teach a class, the gang is shocked when Howard signs up to take it on The Big Bang Theory.

Sheldon in Underwear - The Big Bang Theory
Watch The Big Bang Theory Season 8 Episode 1
"The Locomotion Interruption"
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Leonard and Amy take an unexpected road trip to Arizona on The Big Bang Theory Season 8. They must pick up Sheldon there.

The Big Bang Theory Season 8 Quotes

Amy: Sheldon, there's something else I've been wanting to say, but before I do, I just... I want you to know that you don't have to say it back.I know you're not ready, and I don't want you to say it just because social convention dictates...
Sheldon: I love you, too.
Amy: You said it.
Sheldon: There's no denying I have feelings for you that can't be explained in any other way. I briefly considered that I had a brain parasite. But that seems even more far-fetched. The only conclusion was love.

Now, typically I wear pajamas, but I recently adopted a hobo lifestyle and pajamas are the sleep-pants of the Man. I'll have you know, Mahatma Gandhi wore no pants and a nation rallied behind him!

Sheldon