![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 12 Online
Watch The Big Bang Theory Season 12 full episodes online, free and paid options via our partners and affiliates.
![Keeping a Secret - The Big Bang Theory](https://tv-fanatic-res.cloudinary.com/iu/s--3dGVr2Ei--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1557961134/keeping-a-secret-the-big-bang-theory.jpg)
On The Big Bang Theory Season 12 Episode 24, Sheldon and Amy stick together, and Koothrappali makes a new friend as the gang travels together into the future.
![Big News - The Big Bang Theory](https://tv-fanatic-res.cloudinary.com/iu/s--lI3wg3zo--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1557960938/big-news-the-big-bang-theory.jpg)
On The Big Bang Theory Season 12 Episode 23, as Sheldon and Amy await big news, and Bernadette and Wolowitz leave their kids for the first time.
![Leonard Learns the Truth - The Big Bang Theory](https://tv-fanatic-res.cloudinary.com/iu/s--B5CNV7qJ--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1557096018/leonard-learns-the-truth-the-big-bang-theory.jpg)
On The Big Bang Theory Season 12 Episode 22, Leonard is pleasantly surprised when Beverly comes to visit until he finds out the real reason she's there.
![Turning Him In - The Big Bang Theory](https://tv-fanatic-res.cloudinary.com/iu/s--nqFZq05A--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1556070010/turning-him-in-the-big-bang-theory.jpg)
On The Big Bang Theory Season 12 Episode 21, Kripke has proof that Dr. Pemberton plagiarized his thesis and Sheldon and Amy aren't sure if they should turn him in.
![Not Taken Seriously - The Big Bang Theory](https://tv-fanatic-res.cloudinary.com/iu/s--xJM6vmRV--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1556069786/not-taken-seriously-the-big-bang-theory.jpg)
On The Big Bang Theory Season 12 Episode 20, Koothrappali is worried he won't be taken seriously after publishing a paper saying he may have found alien life.
![Comforting Amy - The Big Bang Theory](https://tv-fanatic-res.cloudinary.com/iu/s--y9_mRmQa--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1554667890/comforting-amy-the-big-bang-theory.jpg)
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](https://tv-fanatic-res.cloudinary.com/iu/s--uA0j6qdP--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1554333443/watching-the-competitors-the-big-bang-theory.jpg)
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](https://tv-fanatic-res.cloudinary.com/iu/s--KA-iMRsm--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1551487771/experimenting-on-the-kids-the-big-bang-theory.jpg)
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](https://tv-fanatic-res.cloudinary.com/iu/s--LR4no3HT--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1550709043/celebrity-dungeons-and-dragons-the-big-bang-theory.jpg)
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](https://tv-fanatic-res.cloudinary.com/iu/s--JA2Wk4l7--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1549071878/leonards-donation-the-big-bang-theory.jpg)
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](https://tv-fanatic-res.cloudinary.com/iu/s--_ABeZJ3K--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1548727738/breaking-the-law-the-big-bang-theory.jpg)
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](https://tv-fanatic-res.cloudinary.com/iu/s--6o3J8aJV--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1547687643/kicking-off-amy-the-big-bang-theory.jpg)
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](https://tv-fanatic-res.cloudinary.com/iu/s--uHog4118--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1545434044/mending-their-relationship-the-big-bang-theory.jpg)
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](https://tv-fanatic-res.cloudinary.com/iu/s--4qBwjsNx--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1545096455/jealousy-the-big-bang-theory.jpg)
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](https://tv-fanatic-res.cloudinary.com/iu/s--DyfdLyxT--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1543966297/the-magic-castle-the-big-bang-theory.jpg)
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](https://tv-fanatic-res.cloudinary.com/iu/s--0mtpLmXy--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1542147858/amy-and-sheldon-are-devastated-the-big-bang-theory.jpg)
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](https://tv-fanatic-res.cloudinary.com/iu/s--6uH0ff6L--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1541387069/bonding-the-big-bang-theory.jpg)
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](https://tv-fanatic-res.cloudinary.com/iu/s--mFXeJD6L--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1540431546/looking-for-a-hideaway-the-big-bang-theory.jpg)
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](https://tv-fanatic-res.cloudinary.com/iu/s--2eenNo4w--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1540431198/halloween-competition-the-big-bang-theory.jpg)
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](https://tv-fanatic-res.cloudinary.com/iu/s---Lmd20np--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1539050130/career-sabotage.jpg)
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](https://tv-fanatic-res.cloudinary.com/iu/s--CAVk6jsO--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1539049907/taking-out-anu-the-big-bang-theory.jpg)
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](https://tv-fanatic-res.cloudinary.com/iu/s--ibCJwpFz--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1538616714/arranging-marriage-the-big-bang-theory.jpg)
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](https://tv-fanatic-res.cloudinary.com/iu/s--NS9XBff2--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1537828769/the-perfect-gift-the-big-bang-theory.jpg)
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](https://tv-fanatic-res.cloudinary.com/iu/s--XM9D2OoY--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1535111678/making-plans-the-big-bang-theory.png)
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.