![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 5 Online
Watch The Big Bang Theory Season 5 full episodes online, free and paid options via our partners and affiliates.
![Leonard & Sheldon Prepare For The Wedding](https://tv-fanatic-res.cloudinary.com/iu/s--H7yVMsN3--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1371232144/leonard-and-sheldon-prepare-for-the-wedding.png)
The gang must hurry to plan a wedding when Howard and Bernadette decide to have the event before the NASA launch on the season finale of The Big Bang Theory.
![Howard Must Reschedule](https://tv-fanatic-res.cloudinary.com/iu/s--0qTFkft1--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1371232142/howard-must-reschedule.png)
With his NASA launch moved up, Howard's wedding must be rescheduled leaving him to deal with Bernadette's family on The Big Bang Theory.
![Penny, Amy, & Bernadette Read Unsettling News](https://tv-fanatic-res.cloudinary.com/iu/s--Fepg0LLb--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1371231679/penny-amy-and-bernadette-read-unsettling-news.png)
Will Wheaton plays a party guest while Bernadette rethinks getting married on The Big Bang Theory.
![Stephen Hawking on The Big Bang Theory](https://tv-fanatic-res.cloudinary.com/iu/s--hPxoIOC2--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1371228723/stephen-hawking-on-the-big-bang-theory.png)
Wolowitz gets to work with Stephen Hawking this week, meaning Sheldon will do anything at all to meet his hero.
![The Future Mrs. Koothrappali?](https://tv-fanatic-res.cloudinary.com/iu/s--MsAyf2Ej--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1371228365/the-future-mrs-koothrappali.png)
Sheldon is haunted by Mr. Spock on this episode of The Big Bang Theory, as Leonard Nimoy guest voices.
![Playing Video Games](https://tv-fanatic-res.cloudinary.com/iu/s--JaYutYTa--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1371227564/playing-video-games.png)
Silly Sheldon. This Big Bang Theory character blows off Amy's aunt's birthday this week just to play video game.
![What's Up with That Hair?](https://tv-fanatic-res.cloudinary.com/iu/s--HhLXhctU--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1371226903/whats-up-with-that-hair.png)
Sheldon's barber gets sick this week, while astronaut training causes Wolowitz to rethink his decision to head into space.
![Pretty Painting](https://tv-fanatic-res.cloudinary.com/iu/s--TR57yu7V--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1371226780/pretty-painting.png)
Sheldon competes against Kripke this week for a job at the University, while a gift from Amy makes Penny uncomfortable.
![Sheldon in the Lab](https://tv-fanatic-res.cloudinary.com/iu/s--DREs5DIE--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1371226571/sheldon-in-the-lab.png)
Sheldon tries to take a vacation this week, by working with Amy at her neurobiology lab. Howard, meanwhile, gets all worked up.
![Really, Sheldon?!?](https://tv-fanatic-res.cloudinary.com/iu/s--nzdj_qoO--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1371226207/really-sheldon.png)
Leonard reconsiders his friendship with Sheldon this week due to the latter's demands. Elsewhere, NASA astronaut Mike Massimino as himself.
![Fun with Flags](https://tv-fanatic-res.cloudinary.com/iu/s--f2HZpSJc--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1371226009/fun-with-flags.png)
Leonard and Penny experiment with dating again this week, while Raj develops an odd connection with his phone's virtual assistant.
![A Romantic Evening](https://tv-fanatic-res.cloudinary.com/iu/s--s7YyQUn6--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1371225781/a-romantic-evening.png)
Leonard asks Penny out on a date this week, causing everyone else to wonder how life might change it it goes well. It's the show's 100th episode!
![The Big Bang Theory Boys](https://tv-fanatic-res.cloudinary.com/iu/s--nsbx79vL--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1371225660/the-big-bang-theory-boys.png)
Sheldon isn't sufficiently impressed by Amy's accomplishment on The Big Bang Theory this week, while Howard must be okay with Bernadette disliking kids.
![The Big Bang Theory Trio](https://tv-fanatic-res.cloudinary.com/iu/s--ka_CUMaT--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1371225068/the-big-bang-theory-trio.png)
Leonard comes face to face wit his high school bully this week. The latter is played by Lance Barber.
![A New Man for Amy?](https://tv-fanatic-res.cloudinary.com/iu/s--v3K14b3o--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1371224741/a-new-man-for-amy.png)
Sheldon grows jealous of Amy dating someone else this week. That other man is Stuart from the comic book store.
![Just the Two of Us](https://tv-fanatic-res.cloudinary.com/iu/s--tSEK6LUs--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1371224417/just-the-two-of-us.png)
Leonard and Penny try to actually hang out alone this week. Meanwhile, Sheldon faces his fear of birds.
![Amy in Action](https://tv-fanatic-res.cloudinary.com/iu/s--u2RNhzJq--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1371224252/amy-in-action.png)
Bernadette and Penny go shopping for a wedding dress on The Big Bang Theory this week. Without Amy!
![A Good Scare](https://tv-fanatic-res.cloudinary.com/iu/s--ciHw91_x--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1371223842/a-good-scare.png)
A comic book artist comes between Leonard and Priya this week. Elsewhere, Sheldon has a goal: scare his pals on Halloween.
![Laurie Metcalf on The Big Bang Theory](https://tv-fanatic-res.cloudinary.com/iu/s--ZFXxhjfg--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1371224007/laurie-metcalf-on-the-big-bang-theory.png)
Laurie Metcalf comes on board this episode of The Big Bang Theory. She plays Sheldon's mother.
![Party with Wil Wheaton](https://tv-fanatic-res.cloudinary.com/iu/s--hYXu88U_--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1371223601/party-with-wil-wheaton.png)
Wil Wheaton returns and hosts a party this week. Sheldon and Leonard are invited. Read on for a recap.
![The Men of The Big Bang Theory](https://tv-fanatic-res.cloudinary.com/iu/s--ST-v0vjS--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1371223175/the-men-of-the-big-bang-theory.png)
Raj meets a girl this week! One with whom he actually communicate!
![The Pulled Groin Extrapolation Scene](https://tv-fanatic-res.cloudinary.com/iu/s--xLI4ld5r--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1371223173/the-pulled-groin-extrapolation-scene.png)
How will Sheldon and Penny get along this week, with Leonard off at a wedding with Amy? That's the main Big Bang Theory question.
![The Infestation Hypothesis Photo](https://tv-fanatic-res.cloudinary.com/iu/s--nJl2-qQY--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1371223015/the-infestation-hypothesis-photo.png)
Amy is caught in the middle this week, as Sheldon and Penny fight. Leonard, meanwhile, tries to spice things up with Priya.
![Amy vs. Penny](https://tv-fanatic-res.cloudinary.com/iu/s--DdXLjjJ3--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1371222329/amy-vs-penny.png)
The Big Bang Theory is back! On the premiere, the gang deals with Penny and Raj actually sleeping together.