The Big Bang Theory (2007–2019)
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The Bachelor Party Corrosion 

1:23 | Trailer
The guys's skills are put to the test when they get a flat tire on the way to Mexico for Leonard's bachelor party. The girls throw Penny a mini-bachelorette party.


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
Keith Carradine ... Wyatt


Because Leonard and Penny eloped, neither got a bachelor or bachelorette party before their marriage. As such, Howard and Raj, with Penny's help, kidnap a willing Leonard and a less than willing Sheldon to take them away to a mystery destination for a bachelor party. The plan in general sits well with Leonard, and a little less so with Sheldon, until he learns of some science related aspects to the plan. But all four will have to use a little more science on this trip than they anticipated. With the boys out of town, the girls have a bachelorette party of their own. As Penny doesn't want to go to a strip club, they decide instead to have a girls' night in to talk about their current lives. Penny's marriage to Leonard and Amy's break-up with Sheldon lead to two telephone calls, one which contains a little more information than Penny would have liked, and a physical transformation for a new look. Written by Huggo

Plot Summary | Add Synopsis


Comedy | Romance


TV-14 | See all certifications »





English | Spanish

Release Date:

5 October 2015 (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?


Following her divorce announcement about her husband Ryan Sweeting, Kaley Cuoco's name in the opening credits were reverted to its original billing. See more »


When the flat occurs it is obvious that the left front of the vehicle drops, but the group attempts to change a flat left rear. See more »


Amy Farrah Fowler: In the spirt of the bachelorette party, I baked cookies shaped like male genitals.
Penny Hofstadter: Oh, Amy, you didn't have... Wow! That is anatomical!
Amy Farrah Fowler: Thank you. The veins are blue gummy worms.
Bernadette Rostenkowski: Oh, look. Jewish and gentile.
Amy Farrah Fowler: I had some dough left over.
See more »

Crazy Credits


Two things to know about what you just saw:

One. That was really Richard Feynman's van.

Two. Richard Feynman's van was not injured in the making of tonight's episode. See more »


References The Avengers (2012) 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

Sad end to what was once OK
6 October 2015 | by christiank7See all my reviews

Sorry to say this but the show has seriously lost the plot and the humor has evaporated along with the entire tempo. The concept has run its course and the time has changed. Geeks are no longer a topic of interest or unusual fad of the moment. I would suggest that the entire show be put to rest and let these people ie the characters die a silent death. I am sure that the producers are really ticked that they paid so much for the actors. Laughable really. Instead of trying to continue with the same story development they require a totally new direction and if they do not do this then the end is already here. In its present state it fails big time.

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