The Big Bang Theory Is Officially Over After Final Episode Airs In America

The end is finally here for Big Bang fans. Viewers have celebrated and cried over the final episode for the long running sitcom, after 12 years on CBS.

The following contains spoilers for the finale

Amy and Sheldon find out they've won the Nobel Prize and the elevator was finally fixed. Penny also revealed that she's expecting a baby with Leonard. Sheldon drove a wedge between him and his pals but managed to heal the rift during an emotional speech while accepting his prize.

She said: "It's a complicated episode. Our writers are much more, like, intellectuals than what you would think of as comedy writers. They are complicated people, so there's a lot of depth to this episode.

"I think that fans will be satisfied. There are things that get tied up, but there are things that are left open."

Kunal Nayyar, who plays Raj in the show, says that the ending is 'beautifully done' and he loved what the did with his character in the finale - but it's not the end for the characters.

He explained: "We're saying goodbye to the show, but in the world [the characters] wake up [the next] morning and go to work, eat Chinese food and hang out and navigate life."

The cast have all been sharing emotional posts on social media in the lead up to the finale.

Kaley Cucuo, who plays the show's Penny, shared a moving black and white image of the all the crew hugging for one last time while filming their final scene.

Kunal also posted on Instagram. His caption certainly pulled on the old heartstrings.

He said: "Thank you. Thank you for your words. Thank you for your encouragement. Thank you for tuning in night in and night out.

"Thank you for the stories you shared about how this show made you feel. Thank you too, for the not so nice times.

"Thank you, for lifting us up when we were down. Fame can feel like a cage, so thank you for making us feel safe enough to be free.

"Thank you for letting me share my birthday on stage with my six best friends, and thank you, for you, because without you - there would be no us.

"So this goes out to you, the fans... One last time. In love and gratitude."