- Penny tries to throw a wrench into Leonard's plan to be a sperm donor for her ex-boyfriend; Wolowitz, Bernadette, Anu and Koothrappali turn Koothrappali's canceled bachelor party into a couple's trip aboard the "vomit comet."
- Penny tries to seduce an abstaining Leonard to ruin his "donation" for her ex-boyfriend, Zack (Brian Thomas Smith), and his wife, Marissa (Lindsey Kraft). Also, Wolowitz, Bernadette, Anu (Rati Gupta) and Koothrappali turn Koothrappali's canceled bachelor party into a couple's trip aboard the Vomit Comet.—glyng2
- Zack and Marissa have set the date of this upcoming Monday - five days away - for Leonard to make his sperm donation, these five days which they have requested he have no sex for optimum results. This time coincides with Wyatt coming for a weekend visit. Babies seems to be the topic of choice between the three, Wyatt who is upset that Penny doesn't want to have children, while Penny does whatever she can both to avoid her father in not wanting to talk about the subject, and seemingly doing whatever she can, short of directly saying that she doesn't want him to do it, to place a kibosh on Leonard's sperm donation. Meanwhile, Raj can't help think that this weekend would have been his and Anu's wedding if they had gone through with it. Associated, Howard had planned a special bachelor party for the guys: to do the Vomit Comet, an experience of weightlessness like in space. As he still has the time booked, Howard and Raj decide they should still do it. However, Leonard can't go because of Wyatt, and Sheldon has no interest, leading to Raj suggesting it be a double date with their significant others. While adrenaline-junkie Anu is up for it, Howard knows that Bernadette would hate the experience so thinks about asking either Bert or Stuart instead. When Bernadette finds out, she becomes upset that Howard didn't ask her. So Howard does invite Bernadette despite knowing she won't like it. How far will Bernadette go to prove Howard wrong even though he's probably right?—Huggo
- Zack and Marissa are visiting Leonard and Penny discussing Leonard's pending fatherly donation. They are both grateful for Leonard's help. Penny still thinks the subject is weird. The Johnsons' also think that it is weird that their kid will look like Leonard. Zack adds that if it's a girl, it'll look like Penny. Leonard needs to abstain from Penny to provide the most potent sample on Monday. They would like to have a son, so Zack wants Leonard to keep thinking "Little boys. Little boys!" Sheldon wanders in on the pretext to borrow a book and mentions how tall and smart he is. Amy runs in and drags him home because Zack and Marissa want them to have Leonard's baby and not his. As Sheldon leaves has also throws in his blue eyes, no cavities in his teeth and not being lactose intolerant.
Raj is visiting Howard and is lamenting his wedding that would have been that week, though at least he is still with Anu. Howard adds the $3000 in airline tickets to India that he can't use. There is also the incredible bachelor party that Howard had planned. Through NASA he got four tickets on the "Vomit Comet" allowing them to feel weightlessness. Raj is excited and suggests a guys' weekend just like in the good old days.
At the cafeteria Howard announces that they can all go on the "Vomit Comet" together. Sheldon is not interested in vomiting, while Penny's father Wyatt (Keith Carradine) is visiting the Hofstadters' over the weekend. Raj suggests then making it a couples' weekend and they could bring Bernadette and Anu. Howard plans to ask Stuart or Bert since he doesn't think that Bernie would like to do that.
Penny comes into the kitchen and finds Leonard taking some vitamins to help his virility. When Wyatt knocks on the door Penny asks Leonard not to bring up the subject of their kids, Zack and Marisa's project or the Cornhuskers. Wyatt comes in calling Penny "Slugger" and complimenting Leonard on his strong handshake. Leonard has been taking vitamins. Penny offers her dad a beer. He replies that he'll one if she is since he knows that she's not pregnant. Penny then blurts out about the Leonard-Zack project to take the subject off of their non-existent kids.
Howard enters the kitchen and asks if Bernie minds if he goes away that weekend with Raj. The two were taking Anu and Stuart which bothers Bernadette that she wasn't asked. Howard insists that she wouldn't want to float around weightless since she got sick while in line to the Tea Cups ride at Disneyland. Bernie decides that she has to go.
Back at the Hofstadters' place, Leonard thanks Penny for throwing him under the bus. Wyatt wants to know why Leonard is okay with not wanting a baby with Penny, but wanting to have one for Penny's dumb ex-boyfriend. Leonard calmly explains that Zack and his wife can't have their own children, and likes that Leonard's a smart and caring person, traits that they want for their kid.
Leonard comes to bed talking about how much Wyatt likes him since Penny used to date idiots. Penny does admit that she did marry a stud. Penny wants to make it up to him after throwing him to the lions earlier. She forgot that Leonard still had three days of abstinence ahead. Penny then comes to bed wearing a sexy outfit, snuggles up to Leonard and seductively starts to read her comic book. "Bam! Pow! Take that Batman!"
The two couples are driving in the car and Anu is so glad that Bernadette could come especially since Howard claimed that it wasn't her thing. Bernadette snaps saying that Howard doesn't know everything. Anu claims to be an adrenaline junkie doing things like roller coasters and snowboarding. Bernadette counters that she once jumped on the back of her shopping cart and rolled through the meat section.
In Apartment 4B Sheldon comes out into the living room, fixes his breakfast and finds Leonard on their couch. Sheldon calls Amy who comes in and is also surprised to find Leonard there. He used his spare key to come in and get away from Penny who wanted to have sex. Amy suggests that Penny still doesn't want him to succeed. If Penny is objecting, Leonard wants her to tell him. He still wants to leave a little of himself behind in the world.
In the airport waiting room, the couples are being briefed for their flight which will be the experience of their life. Bernie tells him that at 90 pounds, she gets weightless if she is holding onto three balloons. While signing the injury and death waivers Bernadette has second thoughts about both of them doing it since they have kids. She was just trying to prove to Howard that he doesn't know her as well as he thinks he does. And if she does it, she can prove him wrong. Anu thinks that she should just be honest. Bernadette agrees and tells Anu that she owes her $3000 for airline tickets.
Penny returns to her apartment and her dad after a long run interrupted by stopping at a diner and a massage chair. Her dad comments that she is not really mad at him and Leonard, but at herself. He says that she regrets her "no baby" plan. Penny agrees that she feels that she is letting everyone down. Wyatt tells her that she could never disappoint him, though her high school years were rough on him. He tells his daughter that whatever she decides he is on her side. Leonard comes marching in and tells Wyatt to back off since it is his and Penny's decision. Wyatt has already discussed it with Penny, but compliments Leonard on being forceful. Leonard then tells Penny that he has changed his mind and he'd be heartbroken if there was a kid out there that he couldn't be the father of.
Back in the airport waiting room, everyone is in jumpsuits though Bernadette declines to go. They have kids and she doesn't think that they should both put themselves in danger. Howard cracks that he didn't see that coming. Howard suggests that she go so she can prove herself right as the plane flies repeatedly up and down and up and down.
Now floating weightlessly Bernadette is yelling that she hates it so much. Anu says that she is proving her husband wrong. Now she LOVES doing it.
Leonard calls Zack and Marissa declining to be their sperm donor, but he does suggest that someone else is interested. While on the phone Amy is yelling at Sheldon that he is not going to do that. Sheldon says on the phone that apparently he is not allowed.
Title reference: Leonard decides to donate his sperm, but then chooses not to do it.
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