Watch The Big Bang Theory Season 5 online

The Big Bang Theory

The Big Bang Theory Season 5 streaming: where to watch online?

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Penny regrets her sleeping with Raj and has become very good friends with Leonard, Leonard breaks up with Priya, Amy pushes Sheldon in their relationship eventually becoming boyfriend and girlfriend, Penny and the other women become a clique of their own, Howard prepares for his wedding and going into space to the International Space Station and Leonard asks Penny out as they begin "Leonard and Penny 2.0".

Episodes

1. 

   1. The Skank Reflex Analysis

   2011-09-22

   Penny worries that she's screwed things up permanently with her friends, while Sheldon takes command of the paintball team.

2. 

   2. The Infestation Hypothesis

   2011-09-22

   Fight between Sheldon and Penny leaves Amy caught in the middle, while Leonard tries to spice up his long-distance relationship with Priya.

3. 

   3. The Pulled Groin Extrapolation

   2011-09-29

   Leonard and Amy get to know each other better, while Howard and Bernadette spend the weekend with Mrs. Wolowitz.

4. 

   4. The Wiggly Finger Catalyst

   2011-10-06

   Raj finally meets a girl he can communicate with.

5. 

   5. The Russian Rocket Reaction

   2011-10-13

   Sheldon and Leonard get invited to a party at Wil Wheaton's house, and Howard gets an out-of-this-world opportunity.

6. 

   6. The Rhinitis Revelation

   2011-10-20

   Sheldon competes with the gang for his mother's attention when she comes to visit.

7. 

   7. The Good Guy Fluctuation

   2011-10-27

   Cute comic book artist puts Leonard and Priya's relationship to the test, while Sheldon tries to scare the guys for Halloween.

8. 

   8. The Isolation Permutation

   2011-11-03

   Amy is crushed when Bernadette and Penny go shopping for wedding dresses without her.

9. 

   9. The Ornithophobia Diffusion

   2011-11-10

   Leonard and Penny try hanging out alone, and Sheldon must overcome his fear of birds.

10. 

    10. The Flaming Spittoon Acquisition

    2011-11-17

    Sheldon considers taking his relationship with Amy to the next level when Stuart from the comic book store asks her out on a date.

11. 

    11. The Speckerman Recurrence

    2011-12-08

    Leonard must face his fears after being contacted by his high school tormentor.

12. 

    12. The Shiny Trinket Maneuver

    2012-01-12

    Sheldon gets in trouble with Amy when he isn't impressed by her recent accomplishment, and Howard must come to grips with Bernadette's dislike of children.

13. 

    13. The Recombination Hypothesis

    2012-01-19

    Everything might change when Leonard offers Penny a spur of the moment invitation to a romantic dinner for two.

14. 

    14. The Beta Test Initiation

    2012-01-26

    Leonard and Penny experiment with dating, while Raj develops a peculiar relationship with his phone's virtual assistant.

15. 

    15. The Friendship Contraction

    2012-02-02

    Sheldon's selfish demands force Leonard to reconsider their friendship. Meanwhile, Wolowitz tries to pick his astronaut nickname.

16. 

    16. The Vacation Solution

    2012-02-09

    When Sheldon is forced to take his vacation, he goes to work with Amy in her neurobiology lab. Meanwhile, Bernadette wants Howard to sign a pre-nup.

17. 

    17. The Rothman Disintegration

    2012-02-16

    When an office at the University opens up, Sheldon must compete for it with his archenemy, Kripke. Meanwhile, a gift from Amy makes Penny uncomfortable.

18. 

    18. The Werewolf Transformation

    2012-02-23

    Sheldon's life is turned upside-down after his barber gets sick. Meanwhile, astronaut training causes Wolowitz to rethink his decision to go into space.

19. 

    19. The Weekend Vortex

    2012-03-08

    Sheldon chooses to play video games with the guys rather than go with Amy to her aunt's birthday party.

20. 

    20. The Transporter Malfunction

    2012-03-29

    Penny buys Leonard and Sheldon "Star Trek" collectibles as a thank-you, leading Sheldon to be haunted by Mr. Spock. Meanwhile, Raj decides he has met the "Future Mrs. Koothrappali" after his parents set him up on a date.

21. 

    21. The Hawking Excitation

    2012-04-05

    When Wolowitz gets to work with Stephen Hawking, Sheldon is willing to do anything to meet his hero.

22. 

    22. The Stag Convergence

    2012-04-26

    Bernadette reconsiders marrying Howard after learning about his sexual history.

23. 

    23. The Launch Acceleration

    2012-05-03

    NASA reschedules Howard's mission, putting his and Bernadette's wedding plans in jeopardy. Meanwhile, Leonard says something surprising to Penny in the bedroom.

24. 

    24. The Countdown Reflection

    2012-05-10

    When Howard and Bernadette decide they want to be married before his NASA launch, the gang rushes to put on a wedding.