After more than a decade of Bazinga's, will-they-won't-they's, Klingon Boggle and one catchy theme tune, it's time to bring the curtain down on The Big Bang Theory.
If it all started with a big bang, then E4 is gearing up to send the show off with an even bigger bang - as we dedicate a whole afternoon to the world's biggest and brightest sitcom. Below are all the crib notes you need for the big day so you won't miss a second of Thursday's stellar line-up.
THE FINAL COUNTDOWN - THURSDAY 23 MAY
Expect plenty of your favourites to make an appearance as we look back at the most popular single episode of each series. We'll be kicking off at 1pm with the iconic 'Pilot' because who doesn't want to bask in the nostalgia of where it all began when Sheldon and Leonard first set eyes on their new neighbour, Penny? Which will be followed by a selection of the very best of all 12 seasons throughout the day.
UNRAVELLING THE MYSTERY
At 7:30pm, Johnny Galecki and Kaley Cuoco host a 30 minute special that is sure to make any super fan shed a tear or two. They'll be sharing some of the show's best kept secrets from behind the scenes and they'll be joined on the studio's main stage by the rest of the cast to reminisce on 12 years-worth of memories, juicy gossip and their favourite moments together.
THE BIG BANG THEORY: FINAL EPISODES FROM 8PM
It's time!! Take a deep breath, get yourself a cuppa (or maybe a glass of Penny's favourite tipple) and settle into your spot... as the last ever two episodes play back-to-back from 8pm. As Season 12 concludes, everything's changing, Sheldon and Amy are awaiting massive news, Raj makes a new friend and Howard and Bernadette leave their kids for the first time. But the question on everybody's lips is, what exactly is Leonard and Penny's secret?
THE BIG BANG THEORY OF EVERYTHING
At 9pm stars and fans alike come together to pay one final farewell in a very special send off. In this hour long goodbye to the world's favourite science nerds, we'll be taking a look at some much-loved scenes from the last 12 series as well as sharing some exclusive behind the scenes footage and maybe one or two red carpet moments.
THE BIG BANG THEORY | INTERACTIVE QUIZ
Sheldon and Leonard got their PhDs a long time ago, but E4 is giving you the chance to get yours - sort of - right now! Fancy becoming a Doctor of Sit-Comology? Of course you do! Take the new interactive quiz using the link below, pass with flying colours and you'll receive one lovely - very purple - certificate of excellence.
So, there's only one thing left to say... DaH jImej!
...That's goodbye in Klingon, have you learnt nothing in 12 years?