The Big Bang Theory (2007–2019)
10 user 3 critic

The Conjugal Conjecture 

As Leonard and Penny attempt to hold another wedding ceremony everyone can attend, they have to deal with Penny's family arriving and Leonard's father spending the night with Sheldon's mother.


Mark Cendrowski


Chuck Lorre (created by), Bill Prady (created by) | 6 more credits »




Episode complete credited cast:
Johnny Galecki ... Leonard Hofstadter
Jim Parsons ... Sheldon Cooper
Kaley Cuoco ... Penny Hofstadter
Simon Helberg ... Howard Wolowitz
Kunal Nayyar ... Raj Koothrappali
Mayim Bialik ... Amy Farrah Fowler
Melissa Rauch ... Bernadette Rostenkowski
Kevin Sussman ... Stuart Bloom
Laurie Metcalf ... Mary Cooper
Keith Carradine ... Wyatt
Judd Hirsch ... Dr. Alfred Hofstadter
Katey Sagal ... Susan
Christine Baranski ... Dr. Beverly Hofstadter
Jack McBrayer ... Randall
Dean Norris ... Colonel Richard Williams


It's the day of Leonard and Penny's formal wedding ceremony, but things have the potential to go horribly wrong because of all the interrelationships between the attendees. Beverly and Mary, and Beverly and Alfred already have issues with each other and thus want to spend as little time with the other as possible. Beverly is threatening not to show as she feels humiliated on the assumption that Alfred and Mary slept together. Sheldon is angry at Alfred for supposedly defiling his mother. Leonard is angry at Sheldon for hating Alfred for supposedly defiling Mary. Penny's mother Susan is angry at Penny for divulging their family's dirty secrets to Leonard. Susan is also angry at Penny's brother Randall for his drug conviction leading to Susan believing Leonard's family will believe they white trash. Susan and Wyatt are not seeing eye to eye on how they should approach either Leonard's family or the wedding. As the ceremony approaches, the unpredictability of the situation may prove to ... Written by Huggo

Plot Summary | Add Synopsis


Comedy | Romance


TV-14 | See all certifications »






Release Date:

19 September 2016 (USA) See more »

Company Credits

Show more on IMDbPro »

Technical Specs


Sound Mix:




Aspect Ratio:

16:9 HD
See full technical specs »

Did You Know?


First appearance of Penny's mother and brother. See more »


Leonard is shown making his mother's tea with a teabag but in The Big Bang Theory: The Maternal Capacitance she stipulates it must be "Oolong, loose " See more »


[first lines]
Sheldon Cooper: Leonard! Leonard!
Leonard Hofstadter: What?
Sheldon Cooper: You realize you and I could become brothers?
Leonard Hofstadter: We're not going to be brothers; we're not going to be step-brothers. Go to sleep.
Sheldon Cooper: I hope you're right, 'cause a grown man living with his brother and his brother's wife is weird.
Leonard Hofstadter: Go to sleep.
Sheldon Cooper: OK.
Sheldon Cooper: You think your father's doing unspeakable things to my mother?
See more »

Crazy Credits


In an effort to encourage transparency among those who seek high office, I am releasing my dog's medical records. As you can see he is receiving acupuncture and taking prednisone for his arthritic knees. This is helping him get on and off the couch. Regardless, he is perfectly fit to serve as my dog.

(Scan of veterinary exam checklist) See more »


History of Everything (Instrumental version)
Written by Barenaked Ladies
Performed by Barenaked Ladies
[Instrumental version of series theme song played over the closing credits]
See more »

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User Reviews

Stopped watching it
22 April 2017 | by ottawa101See all my reviews

To be fair, I turned it off. The second half of the episode could be fantastic and save the rating.

The great show of seasons 1-3 turned into he good show of seasons 4-7 and the tolerable show of 8-9. Now it is just unwatchable. The premise of the show was great. 4 nerd scientists struggle in the real world of pop culture and relationships. They meet a cute girl with the opposite characteristics. By season 3 they all had several girlfriends, all were obsessed with sex and they were the "in crowd" in almost every situation. Everything that made the show different, they changed.

This episode was unwatchable. Penny's brother was just stupid. I would like to elaborate but stupid sums it up. Not realistic, not funny and adds nothing to the show. Terrible character. Nothing made sense. It was a bad Threes Company episode of childish relationship humor. Some day when the batteries die in the remote and I am too lazy to get up, if it is on, I'll watch the entire episode and hope for a great ending.

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