424 - The Roommate Transmogrification
Aired May 19, 2011

The Roommate Transmogrification

Bernadette receives her Ph.D., leaving Howard as the only scientist in their group who isn't a doctor. Meanwhile, Raj becomes Sheldon's new roommate after Leonard starts staying with Priya in his apartment and Raj overhears their "Star Trek"-inspired bedroom fantasy.

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Guest Stars: Carol Ann Susi as Mrs. Wolowitz, Aarti Mankad as Priya, Brian George as Dr. Koothrappali, Alice Amter as Mrs. Koothrappli

Writers: Chuck Lorre (Story), Steven Molaro (Story), Eddie Gorodetsky (Story), Bill Prady (Teleplay), Eric Kaplan (Teleplay), Jim Reynolds (Teleplay)

Director: Mark Cendrowski

WinnerThis episode won our Season 4 episode tournament in June 2011.

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  • The title refers to the change of Sheldon's roommate from Leonard to Raj.

Quotes (25)

Penny: What do you mean 'new roommate'? What happened to Leonard?
Sheldon: Same thing that happened to 'Homo Erectus'. He was replaced by a superior species.
Raj: I'm the new homo in town.

Penny: So that means, you're a doctor, you're a doctor, you're a doctor, you're a doctor and, Howard, you know a lot of doctors.

Howard: You gotta like this: the girlfriend, the ex-girlfriend, bonding over your rooty-tooty stinky booty? (All but Leonard laugh)
Leonard: Kill me.
Sheldon: It wouldn't help. The human body is capable of being flatulent for hours after death.

Sheldon: Here's an interesting fact about alcohol: Man is not the only species that ferments fruit in order to become intoxicated. Can you guess what the other is? Hint: sometimes they pack the alcohol in their trunks.
Penny: Monkeys.
Sheldon: When does a monkey have a trunk?
Penny: When a suitcase just won't do.

Penny: Really still can't talk to me?

News Stories

Title Date Posted
Episode 4.24 Ratings May 20 2011

The fourth season finale of The Big Bang Theory posted an increase on last week's ratings.  Full story

CBS Announces Season 4 Finale April 30 2011

CBS has announced the fourth season finale of The Big Bang Theory.  Full story

Comments (286)

wasim Australia, 03:26 Jul 3 2012.
what happens to penny and raj aftr tht night
MEYO Argentina, 12:21 May 27 2012.
what happened after Raj and penny were in bed ?
Doc Dodge United States, 23:31 Apr 5 2012.
Raj needs to end up with Sheldon's hot sister or Howard's mom after Howard and Bernadette's wedding reception reception
Amit India, 11:46 Mar 15 2012.
big bang theory should continue forever......
Taylor United States, 23:12 Feb 15 2012.
I absolutely love TBBT, I make sure I don't miss it every night!
Grubby Australia, 03:12 Nov 27 2011.
I believe penny will end up with Sheldon in the future as she is the only one he who can sing soft kitty to make him happy ,it a love hate relationship
Laura United States, 23:17 Nov 9 2011.
I know Amy will soon end up in bed with someone...just wondering who it will be.
LAMP France, 14:59 Oct 28 2011.
Since season 4, Penny no longer wears sexily. How she dresses before is to make the shows more interesting to watch.
bob Australia, 05:38 Sep 13 2011.
when is penny and Amy going to do it, like they do it on discovery channel, oh what the hell throw Bernadette into the mix too;-)
Danny Boy United Kingdom, 07:24 Sep 11 2011.
TBBT just gets better & better with every season.I've watched the series from the beginning on Channel 4 & I've laughed my head off with every episode. May this continue.

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