The Big Bang Theory (2007– )
9 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 »

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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?


Title Reference: The title refers to the possibility of Alfred Hofstadter and Mary Cooper having spent the night together. 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 »


Bridal Chorus
From 'Lohengrin'
Composed by Richard Wagner
[The piece is played on the harp as Wyatt walks Penny down the aisle]
See more »

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User Reviews

Why am I still watching this......I wonder
26 September 2016 | by pantearaul-53535See all my reviews

This show used to be very good in the beginning but as of Amy's introduction it started to get pretty dull really quick. These last 3 seasons were so bad that I would rather watch the toilet water for 20 minutes instead of this.It is so cringe worthy nowadays.....I have no idea how they went from one of the best comedies(first 4 seasons) to something so bad that it actually disgusts me. I only watch this show now because of Sheldon Cooper's character.....the rest of the characters are incredibly boring,except for Raj sometimes. And what kind of ending/opening are these ? Seriously,nothing even happened in the opening and the ending of the last season was so dull that I doubt there will be another season after this. Either the writers of this show are starting to get lazy or they just simply don't care anymore. I don't recommend watching this show anymore since in all those last 3 seasons I haven't laughed once........ONCE. I might have puffed some air trough my nose 3-4 times but that was it. Would not watch again.There are far better comedies out there like F.R.I.E.N.D.S, That 70's show , The Office , Modern Family , I.T. Crowd , etc

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