- Sheldon won't tell anyone why he's never mentioned Tam, his childhood best friend, so Leonard takes matters into his own hands. Also, Bernadette and Penny take out Raj's fiancée, Anu, for dinner to get the skinny on her.
- Sheldon receives a message from his best friend in high school, Tam Nguyen, that he is coming to California to show his son around Cal Tech. Sheldon's closest group of friends wonder why Sheldon has never mentioned Tam before. The reason? Sheldon and Tam have not spoken in twenty years since Tam is now on Sheldon's enemies list, because, according to the list, Tam "knows what he did". As such, Sheldon has no intention of meeting with Tam. Whatever the issue, Leonard, Howard and Raj believe that the reason will be nothing material to any normal person and thus without even knowing what it is, already side with Tam. After going through several channels without finding out the reason, Leonard, Howard and Raj do locate Tam on campus to find out directly from him, Tam doesn't divulge why for a very good reason. They eventually do learn the reason from Sheldon, all his friends try to bridge the gap from Sheldon back to Tam. Meanwhile, Penny and Bernadette decide to do some sleuthing on their own about Anu, who Raj has decided to marry. Much like Leonard, Howard and Raj, Penny and Bernadette decide to take the direct approach in going to the hotel where she works as a concierge to introduce themselves. The resulting dinner that Penny, Bernadette and Anu have together may have some unintended consequences.—Huggo
- Amy enters her living room to find Sheldon improving their wedding photographs by adding guests who did not attend like the Wright Brothers. Amy then receives an email from "Tam" (Robert Wu) telling Sheldon that he was visiting Caltech with his son and wanted to get together with his old friend Sheldon. Amy wonders why Sheldon never mentioned his childhood best friend so Sheldon yells at her, "Tam! Tam! Tam! Tam! Tam!" and runs into the bedroom.
In Apartment 4A having dinner, the gang wonders how Raj could be engaged to a woman that he just met. Raj asks for advice on an engagement ring. Bernadette wants to know if she has fingers. Amy enters asking the guys about Tam. No one knows about him. He seems to have betrayed Sheldon and Amy doesn't want to pry into why.
In Bernadette's office, she is playing a video game when Penny enters and is worried about Raj and his new fiance. Penny can't find anything on the internet so Bernie wants her Dad to check with his police buddies. She calls him, but he won't do it because it is illegal.
At lunch, Leonard can't believe that Sheldon has another friend that Leonard has never heard about. Since Leonard knows Sheldon's bathroom schedule, he thought he knew who his friends were. They all wonder what Tam could have done so Howard suggests that they call Sheldon's brother George (Jerry O'Connell).
Later Skyping with George in his office at Dr. Tire, he remembers Sheldon's "little Vietnam buddy". Leonard mentions that he was not even at the wedding. George wonders if he still has his enemies list (and bathroom schedule) and suggests looking it up. Then he changes his mind on asking them to do something about his name on the list for urinating in Sheldon's shampoo bottle before signing off. Howard downloads the enemies list from the Internet and finds Tam Nguyen. Sheldon only lists that Tam "knows what he did". The guys decide to meet Tam and ask him. Howard next finds that Jim Henson made the enemies list for inventing that big yellow bird that scared Sheldon and gave him nightmares.
Penny and Bernadette walk into Anu's hotel lobby. They walk up to the concierge's desk and introduce themselves. She replies that they were there to check her out. Bernadette immediately likes her because she is smart. She is invited out to dinner and then suggests the restaurant Bavel. Penny thinks it's impossible to get reservations as Anu picks up the phone and gets them. Doing impossible things is her superpower. When leaving, Bernadette wonders that if she can get into any restaurant, was Raj the best husband she could find?
The guys wander around a university gathering and find Sheldon's former best friend. He is happy to meet Sheldon's friends since Sheldon hasn't gotten back to him. Leonard says that Sheldon didn't come because he was still upset about ...you know, hoping that Tam knew. He didn't. Tam thinks that Sheldon just moved to California and they drifted apart. Sheldon comes out and Tam is very happy to see him. Sheldon still thinks that Tam betrayed him. Why? When Sheldon moved to California, Tam didn't come with him. Sheldon then storms off leaving Tam in a state of shock.
Leonard finds Sheldon in his office and wants to explain to him that Tam has done nothing. Sheldon yells at him that he never does anything that is stupid and that Leonard could end up on his enemies list. Leonard leaves disgusted and warns him that Sheldon can't afford to lose another best friend.
At dinner, Penny thinks that the restaurant is amazing. Anu adds that she usually gets tipped for doing the impossible. Penny sees LeBron James over at another table. Bernadette then asks why a smart successful woman would want to marry someone she just met. She had tried finding someone herself in her 20's and it didn't work out. Her parents had an arranged marriage and are happy together. Bernadette replies that she married for love and it turned out ...(pause)... fine. Penny adds a "Me, too".
Amy comes home and finds Sheldon on the phone with Howard whom he sees as his new best friend. Neither of them are happy about it. Amy can guess what happened. Sheldon tells her that she knows him so well. Amy offers to be his best friend, but he wants a wife that he can complain to. Sheldon is very angry that Leonard took Tam's side. It seems when Sheldon was accepted at Caltech, he was afraid to move away from home and Tam offered to move out with him and then he didn't do it. Tam found a girlfriend and stayed in Texas. Amy explained that if Tam had moved out there with him, he wouldn't have the great friends he has now. Sheldon thinks about what would have happened and figures that things would be the same.
The girls ask Anu about her craziest request ever. Brittany Spears wanted to blow bubbles and she had to go to Kmart at 3 AM. She then asks about Raj. First they insist that he is great and then that he is fun to hang out with just like another girlfriend. The good part and the bad part. He also bathes with his dog and cries when Hugh Jackman sings. Anu looks a little worried.
Tam enters Sheldon's office at his request. Sheldon forgives him even though Tam insists that he did nothing. Tam had met Beth, loved her and stayed in Texas. Sheldon was meant to move to California and to do amazing things that he (Tam) was very proud of. Sheldon is sorry that things didn't work out for him, but Tam insists that he is very happy.
In the cafeteria, the guys first mention the girls' meeting. Bernadette was pretty drunk and tried to go to sleep in the dryer. Sheldon walks in with Tam. He had been showing Tam and his son around Caltech. Sheldon decided that it was silly to hold his grudge. Sheldon wants them to go do something, but Tam has to get a cab and head to the airport. Sheldon then insists that Leonard can drive them. He then tells his old friend a quick goodbye and leaves.
At work Bernadette is showing an Instagram picture of her and LeBron James. All Penny sees is a smudge three tables back. Raj then calls her and wonders what they told Anu. She now knows he wears ladies' deodorant. Raj asks them to stay away from her. Penny prefers to have them meet again to do some damage control. Bernadette wonders if she could get them into the SoHo House. They "owe" that to Raj.
Title reference: The anxiety caused by Tam's reappearance in Sheldon's life after 20 years of separation.
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