It all started with a big bang back in 2007 when a young, aspiring actress moved across the hall from two nerds in Pasadena, Los Angeles.
Sheldon and Leonard had very different reactions when they first met their lovely neighbour Penny. Leonard was instantly infatuated with her, whilst Sheldon thought of her more as a wild inconvenience. However, over time, Sheldon began to learn from Penny, which helped him to become a better friend and even managed to bag himself a wife!
It's now been over two years since The Big Bang Theory came to an end, but fans have been able to relive Penny and Sheldon's best moments over and over again thanks to Netflix.
Although it's a hard decision to make, fans would probably lean more towards Sheldon as being their favourite character on the show simply because he creates the most entertainment. Every memorable episode or every memorable quote often came from Sheldon. The question today is, just how memorable was he to you?
Do you know him better than Leonard does? If the answer is yes, then you should score 10/10 on this Sheldon true or false quiz!
Answers at the end!