The Big Bang Theory is one of the longest running sitcoms in recent years with a massive 279 episodes, 12 seasons and even a spin off about one of the main characters, Sheldon.
The show focused on a group of scientist friends in Pasadena whose lives change forever when aspiring actress Penny moves into the apartment next door.
The Big Bang Theory focuses not just how different the characters seem to be, but how they respect those differences. Penny learns that being a nerd is actually cool, whilst Leonard discovers that he doesn't need to be a big, tough guy to win the heart of the woman of his dreams.
Thanks to Penny moving in Howard falls in love and starts a family with her co-worker Bernadette. Sheldon meets Amy who helps him through his struggles handling change. Even Raj's selective mutism is helped thanks to Penny.
With The Big Bang Theory on air for such a long time, we were introduced to a whole host of wonderful characters. The question is, do you remember them all?
This quiz is filled with some familiar faces and some not so familiar faces. Can you identify them all? Let's find out!
Don't forget, all the answers can be found at the end of the quiz. Good luck!