![The Big Bang Theory](https://tv-fanatic-res.cloudinary.com/iu/s--iQdBt3rU--/c_fill,h_315,w_851/d_tv-fanatic-placeholder-square.png,f_auto,fl_lossy,q_75/v1421782016/banner/the-big-bang-theory.jpg)
The Big Bang Theory
Thursdays 8:00 PM on CBSWatch The Big Bang Theory Season 8 Online
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](https://tv-fanatic-res.cloudinary.com/iu/s--cFMkLXj---/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1430340046/decision-time-the-big-bang-theory.jpg)
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](https://tv-fanatic-res.cloudinary.com/iu/s--8JEzaac3--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1430339109/the-mothers-visit-the-big-bang-theory.jpg)
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](https://tv-fanatic-res.cloudinary.com/iu/s--morJ0MMU--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1429737019/sexy-grads-the-big-bang-theory.png)
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](https://tv-fanatic-res.cloudinary.com/iu/s--RjauL_dR--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1429148368/the-message-the-big-bang-theory.jpg)
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](https://tv-fanatic-res.cloudinary.com/iu/s--KaGcCRmN--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1428529342/the-fort-test-the-big-bang-theory.jpg)
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](https://tv-fanatic-res.cloudinary.com/iu/s--chDV5v-P--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1426817402/ping-pong-battle-the-big-bang-theory.jpg)
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](https://tv-fanatic-res.cloudinary.com/iu/s--EriApcrL--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1426022110/the-family-dinner-the-big-bang-theory.jpg)
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](https://tv-fanatic-res.cloudinary.com/iu/s--Y56xHDWu--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1425508581/going-to-mars-the-big-bang-theory.jpg)
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](https://tv-fanatic-res.cloudinary.com/iu/s--PNS5u_Ng--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1424219980/the-love-experiment-the-big-bang-theory.jpg)
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](https://tv-fanatic-res.cloudinary.com/iu/s--l98rcqRG--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1424219747/an-uncanny-resemblance-the-big-bang-theory.jpg)
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](https://tv-fanatic-res.cloudinary.com/iu/s--N2m5dK5J--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1423008540/embarassing-moments-the-big-bang-theory.jpg)
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](https://tv-fanatic-res.cloudinary.com/iu/s--SIKCmfQW--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1422296994/sheldons-experiment-the-big-bang-theory.jpg)
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](https://tv-fanatic-res.cloudinary.com/iu/s--TsdeNPVW--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1420326183/dress-shopping-the-big-bang-theory.jpg)
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](https://tv-fanatic-res.cloudinary.com/iu/s--l3J0Cj9l--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1418245426/the-clean-room-the-big-bang-theory.jpg)
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](https://tv-fanatic-res.cloudinary.com/iu/s--Iw2k5wv1--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1416434956/fun-with-flags-the-big-bang-theory.jpg)
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](https://tv-fanatic-res.cloudinary.com/iu/s--MPriZ2tt--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1415216756/leonards-surgery-the-big-bang-theory.jpg)
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](https://tv-fanatic-res.cloudinary.com/iu/s--jlPWnK2N--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1415216366/the-prom-the-big-bang-theory.jpg)
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](https://tv-fanatic-res.cloudinary.com/iu/s--0IkHguy4--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1414632937/science-and-sexuality-the-big-bang-theory-s8e7.jpg)
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](https://tv-fanatic-res.cloudinary.com/iu/s--29q8L5ty--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1412984987/the-steam-tunnel-the-big-bang-theory.jpg)
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](https://tv-fanatic-res.cloudinary.com/iu/s--_3RaHVoD--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1412984647/new-ways-to-procrastinate-the-big-bang-theory.jpg)
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](https://tv-fanatic-res.cloudinary.com/iu/s--AV6Eej4q--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1411871619/the-cold-shoulder-the-big-bang-theory.jpg)
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](https://tv-fanatic-res.cloudinary.com/iu/s--g0XEbyp8--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1411871213/the-nervous-pitch-the-big-bang-theory.jpg)
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](https://tv-fanatic-res.cloudinary.com/iu/s--NqnFjKLR--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1411293397/sheldons-class-the-big-bang-theory.jpg)
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](https://tv-fanatic-res.cloudinary.com/iu/s--1uw53l25--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1409248255/sheldon-in-underwear-the-big-bang-theory.png)
Leonard and Amy take an unexpected road trip to Arizona on The Big Bang Theory Season 8. They must pick up Sheldon there.