Sheldon Cooper (played by Iin Armitage and Jimim Parsons in different stages of his life) there were not many friends growing, but the guy's guy tied to one person after being fast in high school. Tam Nguyen (Ryan Feung) was introduced in season 1 Young Sheldon and hit him with Sheldon over comics and their other nervous interests. Outside of Tam be one of the few people Sheldon tolerates, however, they are not super close. However, they were close enough for Sheldon to hold a lifelong outcry against his old classmate, for which we learn 12th and last season of Big Bang's theory.

Adult Tam (Robert Wu) appears in season 12, Episode 4, "Tam's turbulence", to visit his old friend in Kaltech, but he does not receive a warm welcome. Simply put, Sheldon is angry at Tam who returned to the promise to attend Kaltech with him during the day because he met a girl and chose to stay in Texas. This angered Sheldon because he did not want to separate from his friend after moving to a new state, especially not above something as insignificant as romance.

Of course, Sheldon never expressed these feelings of Tam, who did not find out about their argument until the said episode "Big Bang Theory", which was set 20 years after the events of their last exchange. Despite losing contact with his friend, however, Tam is given a pretty sweet story in the big pattern of things.

The real reason that Tam is not mentioned in the "Big Bang theory" until the season 12 is due to that specially created for the Prequel series. After all, "Young Sheldon" only came true thanks to Jimim Parsons incident It inspired Jacques Lore and Co. To make a new sitcom, so the character of Tam was not even in their mind when they came up with the idea of ​​"Big Bang theory". However, spin-off has forced the creators to create a greater synergy between the two shows, and the return of Tam is a major example of that.

"Tam's turbulence" confirms that the title has married and has had children, giving him life he wants. Moreover, he even makes changes to Sheldon before returning to Texas and the story ends on a happy note, with no more included on the list of hostile lists on his old Pal. at the airport.

"Young Sheldon" has also changed the controversial story of "Big Bang theory" It has led Sheldon to hold out for years against his father. Unfortunately he did not get a chance to solve these problems before Death death of George St. In Season 7 of "Young Sheldon"And it turned out to be a big misunderstanding.

Both Big Bang's theory and "Young Sheldon" are currently moving to Max.