The Big Bang Theory

The Best Episodes of The Big Bang Theory Season 5

Genre:Comedy
Network:CBS

Every episode of The Big Bang Theory Season 5 ranked from best to worst. Discover the Best Episodes of The Big Bang Theory Season 5!

Physicists Leonard and Sheldon find their nerd-centric social circle with pals Howard and Raj expanding when aspiring actress Penny moves in next door.
Episodes
24
Avg. Rating
7.9
S1
S2
S3
S4
E1
E2
E3

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  1. 8.5/10(4.8k votes)

    #1 - The Good Guy Fluctuation

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    S5:E7

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

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    Writer:N/A
  2. 8.5/10(4.5k votes)

    #2 - The Hawking Excitation

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    S5:E21

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

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    Writer:N/A
  3. 8.5/10(4.3k votes)

    #3 - The Countdown Reflection

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    S5:E24

    The fifth season ends with Howard and Bernadette deciding to get married before his NASA mission, causing the gang to scurry into overdrive in an effort to stage the wedding. NASA astronaut Mike Massimino has a cameo as himself.

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    Writer:N/A
  4. 8.2/10(4.2k votes)

    #4 - The Beta Test Initiation

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    S5:E14

    Leonard and Penny deal with the idea of starting a relationship again and Raj finally finds a "woman" he can talk to without being drunk, in the form of Siri on his new phone. Meanwhile, Sheldon decides to start a YouTube series entitled "Sheldon Cooper presents Fun with Flags" with the help of Amy.

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    Writer:N/A
  5. 8.2/10(4.1k votes)

    #5 - The Werewolf Transformation

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    S5:E18

    Sheldon becomes agitated when his regular barber is out sick. Astronaut training causes Howard to reconsider wanting to go into space. Penny beats Leonard in chess, the first time she plays.

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    Writer:N/A
  6. 8.1/10(4.1k votes)

    #6 - The Ornithophobia Diffusion

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    S5:E9

    Leonard and Penny try hanging out as friends on a 'non-date', but end up purposely ruining each others chances with perspective dates. Meanwhile, Sheldon enlists the help of Bernadette and Amy to overcome his fear of birds.

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    Writer:N/A
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  8. 8.1/10(4.2k votes)

    #7 - The Recombination Hypothesis

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    S5:E13

    Leonard, who broke up with Priya, asks Penny out to a spur-of the-moment romantic dinner for two, and the duo contemplates on their relationship.

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    Writer:N/A
  9. 8.1/10(3.9k votes)

    #8 - The Weekend Vortex

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    S5:E19

    Sheldon must choose between joining Amy at her aunt's birthday party or playing videogames all weekend with the guys.

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    Writer:N/A
  10. 8.1/10(4.0k votes)

    #9 - The Transporter Malfunction

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    S5:E20

    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.

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  11. 8.1/10(3.8k votes)

    #10 - The Launch Acceleration

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    S5:E23

    When NASA moves up Howard's mission, he must face his fears and Bernadette's dad, thus putting the wedding plans in jeopardy. Meanwhile, Leonard says something surprising to Penny in the bedroom.

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    Writer:N/A
  12. 8.0/10(4.7k votes)

    #11 - The Skank Reflex Analysis

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    S5:E1

    Penny is worried with how damaged her friendship with the guys will be in the aftermath of her sleeping with Raj while Sheldon becomes the leader of the paintball team.

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    Writer:N/A
  13. 8.0/10(4.2k votes)

    #12 - The Infestation Hypothesis

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    S5:E2

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

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    Writer:N/A
  14. 8.0/10(4.0k votes)

    #13 - The Russian Rocket Reaction

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    S5:E5

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

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    Writer:N/A
  15. 7.9/10(4.0k votes)

    #14 - The Flaming Spittoon Acquisition

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    S5:E10

    When Stuart asks Amy out on a date, Sheldon must confront his feelings and consider where his relationship with Amy is going.

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    Writer:N/A
  16. 7.8/10(4.1k votes)

    #15 - The Wiggly Finger Catalyst

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    S5:E4

    Penny plays Matchmaker for Raj, which results in him finding a girl he is comfortable talking to.

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    Writer:N/A
  17. 7.8/10(3.9k votes)

    #16 - The Rothman Disintegration

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    S5:E17

    Sheldon battles Kripke for a coveted office at the university. Penny receives a very unusual gift from Amy.

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    Writer:N/A
  18. 7.7/10(3.8k votes)

    #17 - The Friendship Contraction

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    S5:E15

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

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    Writer:N/A
  19. 7.7/10(3.9k votes)

    #18 - The Stag Convergence

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    S5:E22

    After the guys throw Howard a bachelor party, Bernadette reconsiders marrying him after learning about his sexual history.

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    Director:Peter Chakos
    Writer:N/A
  20. 7.6/10(4.0k votes)

    #19 - The Pulled Groin Extrapolation

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    S5:E3

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

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    Writer:N/A
  21. 7.6/10(3.9k votes)

    #20 - The Isolation Permutation

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    S5:E8

    Amy becomes heartbroken when she discovers that Penny and Bernadette went wedding dress shopping without her.

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    Writer:N/A
  22. 7.6/10(3.9k votes)

    #21 - The Shiny Trinket Maneuver

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    S5:E12

    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.

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    Writer:N/A
  23. 7.5/10(4.0k votes)

    #22 - The Rhinitis Revelation

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    S5:E6

    Sheldon's mother, Mary Cooper, comes to visit, but Sheldon is annoyed that she also spends time with the rest of the gang, instead of catering to his every demand.

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    Director:Howard Murray
    Writer:N/A
  24. 7.5/10(3.8k votes)

    #23 - The Vacation Solution

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    S5:E16

    When Sheldon is forced to take his vacation, he goes to work with Amy in her neurobiology lab.

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    Writer:N/A
  25. 7.3/10(4.0k votes)

    #24 - The Speckerman Recurrence

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    S5:E11

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

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    Writer:N/A

Season 5 Ratings Summary

"The Good Guy Fluctuation" is the best rated episode of "The Big Bang Theory" season 5. It scored 8.5/10 based on 4783 votes. Directed by Mark Cendrowski and written by N/A, it aired on 10/27/2011. This episode is rated 0.0 points higher than the second-best, "The Hawking Excitation".