Running for a massive 12 seasons, The Big Bang Theory followed Sheldon, Penny and Leonard along with the rest of their friends.
When wannabe actor Penny moved into the apartment across the hall from Leonard and Sheldon, their lives changed forever. We got to see Penny and Leonard get married. Sheldon found Amy, a person who understood him and loved his quirks. Howard was introduced to Bernadette; whilst although Raj never settled down he learnt that love was out there somewhere.
Outside of the main cast of stars, The Big Bang Theory was filled with an amazing group of characters. From Howard's mother Debbie to comic book store owner Stuart.
We got to hang out with polar opposite parents Mary Cooper and Dr. Beverley Hofstadter. Raj's dermatologist girlfriend Emily and geologist Bert.
The show saw so many different characters over its 279 episodes, the question is do you remember them all? Each question features two characters from the show, all you need to do is work out which of the pair appeared in the most episodes.
Let's see if you can prove you are an expert in all things The Big Bang Theory in this ultimate character quiz!