The living room of Apartment 4A, daytime. Leonard and Sheldon are playing the three dimensional chess game from the original Star Trek series. It is Leonard’s move. He takes his time, moving round the board and checking things from various angles. Finally, he tentatively makes a move. Sheldon moves almost immediately.
Oh, better than North Dakota! (Pause) I guess that joke's only funny in Nebraska.
Sheldon
From the data at hand you really can't draw that conclusion. All you can say with absolute certainty is that that joke is not funny here.
Penny
Boy, it's good to be back.
Leonard
How was your family?
Penny
Ugh, it was the worst trip, everyone got sick over the weekend.
Sheldon
Sick?
Leonard
(Knowing what's going to happen) Here we go.
Sheldon
(Running to opposite side of the room) What kind of sick?
Penny
Oh, the flu I guess.
Sheldon
I don't need you to guess, I need you to know, now when did the symptoms first appear?
Penny
Maybe Friday.
Sheldon
Friday, was that morning or afternoon?
Penny
I... I don't...
Sheldon
Think woman, who blew their nose and when?
Leonard
Sheldon, relax, she doesn't have any symptoms, I'm sure she's not contagious.
Sheldon
Oh please, if influenza was only contagious after symptoms appear it would have died out thousands of years ago. Somewhere between tool using and cave painting, homo habilus would have figured out to kill the guy with the runny nose.
Leonard
Penny, you'll have to excuse Sheldon, he's a bit of a germophobe.
Penny
Oh, it's okay, I understand.
Sheldon
Thanks for your consideration, now please leave.
Leonard
You'd better go before he starts spraying you with Lysol.
Penny
Okay, well, thank you for getting my mail.
Leonard
No problem. Welcome home. (Sees Penny out. Turns to find Sheldon spraying the air with Lysol.)
Sheldon
What?
Credits sequence
Scene
The kitchen of Apartment 4A night time. Sheldon is busy doing something scientific. There is a lot of scientific paraphernalia strewn across the table. Leonard comes in.
Leonard
What the hell are you doing?
Sheldon
I'm making petri dishes to grow throat cultures.
Leonard
(confusedly) With lime jello?
Sheldon
I need a growth medium, and someone polished off the apricot yoghurt. Here, swab my throat. (opens his mouth)
Leonard
I don't think so.
Sheldon
Leonard! If I'm going to get ahead of this thing I need to find out what's growing in my throat. (opens his mouth again)
Leonard
Sheldon, you are not sick. This is, but you are not.
Sheldon
We have no idea what pathogen Typhoid Penny has introduced into our environment. And having never been to Nebraska I'm fairly certain that I have no cornhusking antibodies.
Leonard
Sheldon, don't you think you're overreacting?
Sheldon
When I'm lying comatose in a hospital relying on inferior minds to cure me, these jello cultures and my accompanying notes will give them a fighting chance. (opens his mouth yet again, insistently)
Leonard
(annoyed) I'm going back to bed.
Sheldon
Wait. (Handing him a measuring jug) Put this in the bathroom.
Leonard
What for?
Sheldon
I need to measure my fluid intake and output to make sure my kidneys aren't shutting down.
Leonard
(angry) I mix pancake batter in this!
Sheldon
No, that measuring cup has always been for urine.
Leonard
You had time to make a label for everything in this apartment, including the label maker, but you didn't have ten seconds to make one that said urine cup?
Sheldon
It's right here on the bottom.
Leonard
Huh. I guess I owe the Betty Crocker company a letter of apology.
Scene
Sheldon’s bedroom, early morning. Sheldon wakes up and coughs heavily. He picks up an electronic thermometer, sticks it in his ear, and takes his temperature.
Sheldon
(Examining the results) Oh, dear God. (Shouting) Leonard! Leonard, I'm sick!
Cut to Leonard entering the living room in panic, stumbling and trying to put on a pair of trousers.
Sheldon
(Voice off) Leonard! Leonard I'm sick!
Leonard grabs his jacket and keys and leaves through the front door, closing it as quietly as possible, right before...
Sheldon
(Entering, wrapped in his duvet) Leonard! Leonard! Leonard. (Drops his duvet) Leonard, my comforter fell down, and my sinuses hurt when I bend over. Leonard? (Bends to get phone) Ow!
Leonard
(Voice on phone) Hey.
Sheldon
Leonard, where are you?
Leonard
(Running down stairs) I'm at work.
Sheldon
At six-thirty in the morning?
Leonard
Yes.
Sheldon
On Sunday?
Leonard
Yes.
Sheldon
Why?
Leonard
They asked me to come in.
Sheldon
Well, I didn't hear the phone ring.
Leonard
They texted me.
Sheldon
Well, as I predicted, I am sick. My fever has been tracking up exponentially since 2am, and I am producing sputum at an alarming rate.
Leonard
No kidding?
Sheldon
No. Not only that, it has shifted from clear to milky green.
Leonard
Alright, well, get some rest and drink plenty of fluids.
Sheldon
What else would I drink? Gasses? Solids? Ionised plasma?
Leonard
Drink whatever you want.
Sheldon
I want soup.
Leonard
Then make soup.
Sheldon
We don't have soup.
Leonard
I'm at work, Sheldon. (A woman enters the apartment building with a barking dog.)
Sheldon
Is that a dog?
Leonard
Yes,
Sheldon
In the lab?
Leonard
Yes, they're training dogs to operate the centrifuge for when they need dogs to operate the centrifuge for blind scientists, I have to go.
Scene
Howard’s bedroom. Howard is fast asleep. The phone starts ringing.
Well I'd like to point out, I voted for orang-utan, but you shouted me down. (Phone rings).
Leonard
Oh, hi Penny!
Penny
Hey, where are you?
Leonard
I'm... uh... at work.
Penny
You sound funny.
Leonard
I'm... uh... in a... I'm in a radiation suit. What's up?
Penny
Yeah, well I'm at work too, and you'll never guess who's here infecting my entire station.
Leonard
(To Howard and Raj) Sheldon's at the Cheesecake Factory. (Into phone) Just tell him to go home.
Penny
He won't leave, he says he's afraid he'll pass out on the bus and someone will harvest his organs.
Leonard
(To Howard and Raj) He's paranoid, and he's established a nest.
Penny
Can you please come get him?
Leonard
Uh, yeah, I'd be... I'd be happy to Penny. (Holds phone up, Howard makes warning siren noises) Oh my God there's a breech in the radiation unit (Raj joins in) The whole city is in jeopardy, oh my God, Professor Googenfeil is melting, gotta go, bye! (To Howard and Raj) I feel really guilty.
Raj
You did what you had to do. (Steals some of Howard’s popcorn)
Howard
Take your stinking paws off my popcorn you damn dirty ape.
Scene
The stairwell.
Sheldon
Thanks for bringing me home.
Penny
Oh, it's okay, I didn't really need to work today, it's not like I have rent or car payments or anything.
Sheldon
Good. Good.
Penny
Okay, well, you feel better.
Sheldon
Wait, where are you going?
Penny
Um, home, to write some bad checks.
Sheldon
You're going to leave me?
Penny
Sheldon, you are a grown man, haven't you ever been sick before?
Sheldon
Well, of course, but, not by myself.
Penny
Really, never?
Sheldon
Well, once. When I was fifteen, and spending the summer at the Heidelberg Institute in Germany.
Penny
Studying abroad?
Sheldon
No, visiting professor. Anyway, the local cuisine was a little more sausage-based than I'm used to, and the result was an internal blitzkrieg with my lower intestine playing the part of Czechoslovakia.
Penny
And there was no-one there to take care of you?
Sheldon
No. No, my mom had to fly back to Texas to help my dad because the house had slipped off the cinderblocks again.
Penny
Again?
Sheldon
It was tornado season. And it was an aluminum house. Anyway, the housekeeper in the faculty residence didn't speak any English, when I finally managed to convince her I was sick, she said “Möchtest Du eine Darmspülung?”
Penny
What does that mean?
Sheldon
Based on what happened next, I assume it means “would you like an enema?”
Penny
Okay, sweetie, I'll take care of you, what do you need?
Sheldon
Well, my mom used to give me sponge baths.
Penny
Okay, ground rules, no sponge baths, and definitely no enemas.
Sheldon
Agreed.
Scene
The cinema.
Raj
Here we go, ten and a half hours of apey goodness.
Leonard
Oh dammit, my glasses. Okay, I'm blind here guys, can you help me find them?
Howard
Sorry. (Crunching sound) Found ‘em.
Leonard
Oh great.
Howard
Sorry, don’t you have a spare.
Leonard
Yeah, at home.
Raj
Well if you leave now, you can be back before the gorillas rip the crap out of Charlton Heston.
Howard
Unless Sheldon’s there, in which case you’ll be trapped forever in his whiny hyper neurotic snot-web.
Leonard
(Dials phone) Hi, Penny. I was wondering, is Sheldon still at the restaurant? Okay, that was very nice of you. Okay, gotta go, got kind of a full blown Chernobyl thing here, gotta go, bye. (To Howard) He’s home, I’m screwed. Ten and a half hours of apey blurriness.
Raj
How about Lasic?
Leonard
You want me to get eye surgery?
Raj
Would you rather go back to the apartment and deal with Sheldon, or have a stranger carve out your corneas with a laser beam?
I'll teach you. “Soft kitty, warm kitty, little ball of fur, happy kitty, sleepy kitty, purr purr purr.” Now you.
Penny
(After a loud sigh) Soft kitty, warm kitty...
Sheldon
Little ball of fur. Keep rubbing.
Penny
(Through gritted teeth) Little ball of fur.
Scene
The living room door, a fiber-optic camera emerges from underneath. We see the scene from its point of view. Cut to outside. Raj is holding a laptop, Howard is feeding the camera under the door.
Leonard
What do you see, what do you see.
Raj
The living room appears to be empty.
Leonard
Okay, he must be in his bedroom. My spare glasses are in my bedroom, on my dresser, next to my Bat-signal.
Howard
I'm not going in there.
Leonard
Raj?
Raj
No way, Jose.
Leonard
Well I can't do it, I can't see anything.
Howard
It's all right, wireless mini-cam and Bluetooth headset. We'll be your eyes.
Leonard
Fine.
Howard
One more thing. This is a subsonic impact sensor. If Sheldon gets out of bed and starts to walk, this device will register it and send a signal to the laptop. At that point, based on the geography of the apartment and the ambulatory speed of a sick Sheldon, you'll have seven seconds to get out, glasses or no glasses.
Leonard
Won't my footsteps set it off?
Howard
No, you'll be on your hands and knees. Now you'll need to get the sensor as close as you can to Sheldon's room.
Leonard
Well, how do I carry it if I'm on my hands and knees?
Cut to Leonard entering apartment on hands and knees, carrying the sensor in his teeth.
Howard
Stay low. Bear left. Now keep true.
Leonard
What?
Howard
It means go straight.
Leonard
Then just say go straight.
Howard
You don't stay go straight when you're giving bearings, you say keep true.
Leonard
Alright (Bangs head on a trunk.) I just hit my head.
Howard
Because you didn't keep true. (Time shift, Leonard is now outside bedrooms) Okay, turn right.
Raj
The... the picture's breaking up.
Howard
Angle your head to the right. A little more. A little more. (Leonard now has his head at right angles to his body) That's it, now just keep true. Alright, you're close enough to Sheldon's room, deploy the sensor. Now turn it on.
Leonard
It wasn't on?
Howard
No.
Leonard
Then why did I have to crawl?
Howard
Oh, I guess you didn't.
Leonard
Okay, it's on.
Howard
Good. From this point forward you will have to crawl.
Leonard
I know.
Howard
Hang on, the sensor's picking up something, turn your head back. (Camera angle shows a pair of female legs.)
Penny
You rat bastard.
Howard
(Running down stairs with Raj) Told you the sensor would work.
Leonard
Hi!
Penny
You deliberately stuck me with Sheldon.
Leonard
Well, I had to, you see what he's like.
Sheldon
(Off) Penny! Penny, I'm hungry.
Penny
Uh, it's okay, sweetie, good news, Leonard's home!
Leonard
No!
Penny
(Handing him vaporub) Here you go, good luck, bye.
Leonard
W-wait!
Sheldon
Leonard, I'm hungry!
Leonard
Wait! Penny! Take me with you! (Runs after her and bumps into pillar. Falls semi-conscious to the floor. Sheldon appears in his comforter.)
Sheldon
I want grilled cheese.
Time shift. Sheldon and Leonard are on the sofa. Sheldon is wrapped in his comforter, Leonard is holding an ice-pack to his forehead.
Sheldon
Do you think Penny will come here and take care of us?
Leonard
I don't think Penny's ever coming here again.
Sheldon
I'm very congested.
Leonard
Yeah, so?
Sheldon
Can you go to the kitchen, and get me the turkey baster labelled mucus.