The Big Bang Theory (2007–2019)
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The Proton Displacement 

Sheldon seeks payback when Arthur "Professor Proton" Jeffries asks Leonard for help on a project instead of him. Raj gets upset at Howard for crashing his night with the girls.


Mark Cendrowski


Chuck Lorre (created by), Bill Prady (created by) | 8 more credits »




Episode complete credited cast:
Johnny Galecki ... Leonard Hofstadter
Jim Parsons ... Sheldon Cooper
Kaley Cuoco ... Penny
Simon Helberg ... Howard Wolowitz
Kunal Nayyar ... Raj Koothrappali
Mayim Bialik ... Amy Farrah Fowler
Melissa Rauch ... Bernadette Rostenkowski
Bob Newhart ... Arthur Jeffries
Bill Nye ... Bill Nye


Leonard, Sheldon and Amy run into Leonard and Sheldon's childhood hero Arthur Jeffries, aka Professor Proton, the scientist host of their favorite childhood television program. Because of this re-acquaintance, Arthur, who always wanted to be a true scientist as opposed to a kid's show host, asks Leonard to read and review a paper he is writing, but he doesn't ask Sheldon, which Sheldon can't understand. With some innuendo from Amy, Sheldon finally realizes that it's because he annoys Arthur. Sheldon tries unsuccessfully to make amends with Arthur so that he can collaborate on the paper. Without the friendship of his childhood hero, Sheldon decides to get a replacement model. Arthur makes Leonard truly examine his friendship with Sheldon, and in turn Leonard ends up getting Arthur to see Sheldon in a slightly different light. Meanwhile, Raj has been invited to girls' night with Penny, Amy and Bernadette. Raj's night with the girls ends up being taken over by an unexpected fifth. Written by Huggo

Plot Summary | Plot Synopsis


Comedy | Romance


TV-14 | See all certifications »






Release Date:

7 November 2013 (USA) See more »

Company Credits

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Technical Specs


Sound Mix:




Aspect Ratio:

16:9 HD
See full technical specs »

Did You Know?


Title Reference: Professor Proton getting replaced/displaced by Bill Nye the Science Guy as Sheldon's Idol after he picks Leonard to review his research paper. See more »


When Amy makes tea for Sheldon, you can see her take a dry tea bag from the cup and set it on the counter. If she just made tea the bag would be wet and dark, not bright white and dry. See more »


[first lines]
[Sheldon is skipping through the store]
Amy Farrah Fowler: Never seen him this happy before.
Leonard Hofstadter: That's because you've never seen him on restock the medicine-cabinet day.
Sheldon Cooper: Look! a new topical antihistamine with lidocaine. Wow! I can't wait 'til I get a rash.
Leonard Hofstadter: Ohhhh, Gas-Ex has a new ultra-strength. Guess they really do read their mail.
Sheldon Cooper: Hey. Isn't that Professor Proton?
Leonard Hofstadter: Oh, yeah.
Sheldon Cooper: Look at him! he's standing in line, like he wasn't moderately famous thirty years ago. Let's go say hello!
Leonard Hofstadter: Oh, maybe we, we ...
See more »

Crazy Credits


Dear Guys Working on the 405 Freeway, How's it going? I only ask because you started work over five years ago to add more lanes and, well... there aren't any. I've also noticed that on most days you're not actually doing anything. Is it possible you've grown bored with the project? I certainly would understand that. I've got more than a few half- finished scripts sitting in my desk. Of course, when I blow off my job millions of commuters aren't, how shall we say... fornicated. (Hey, maybe we should call it the 4-nication-05 freeway!) Regardless, I just want you to know that I'm rooting for you to complete your Herculean task and cut the ribbon on what will undoubtedly be a meaningless effort to ease traffic. I'd also like to offer up a few suggestions. From my untrained eye, you appear to be understaffed. Perhaps you might consider hiring a few thousand more guys and work in 'round the clock shifts, instead of, you know, just when you feel like it. Also, to avoid angry commuters flipping you off, how about giving them a heads up when you close an off ramp for no apparent reason? (Maybe a few miles in advance instead of a hundred yards.) And finally, I need to ask a small favor. Several times a week I crawl along the ol' 4-nication-05 with a bladder that is near to bursting. How about we work out a system where I, and other urinary-challenged drivers, get to pull over and share your port-a-potties? Maybe we can repay your hospitality by bringing you fresh magazines to read while you're in there working.

Sincerely, Chuck Lorre See more »


References Bill Nye, the Science Guy (1993) See more »


History of Everything
Written by Barenaked Ladies
Performed by Barenaked Ladies
[Series theme song played during the opening titles]
See more »

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User Reviews

Bob Newhart made a welcome return appearance in "The Photon Displacement" ep of "The Big Bang Theory"
19 November 2013 | by tavmSee all my reviews

In this ep of "The Big Bang Theory": Leonard, Sheldon, and Amy are at the drug store where they bump into Professor Photon a.k.a. Arthur Jeffries (Bob Newhart in a welcome return guest appearance). Of course, it's Sheldon who bothers him thinking they're now good friends. Dr. Jeffries later e-mails Leonard about helping him on a project which bothers Sheldon. Meanwhile, Amy, Bernadette, and Penny are hanging with Raj making jewelry when Howard stops by and offers help. I'll stop there and just say this was another funny ep of "The Big Bang Theory" with another good performance by Newhart and an amusing cameo by Bill Nye, the Science Guy. So on that note, "The Photon Displacement" is another good enough ep of "The Big Bang Theory".

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