The Big Bang Theory finale: Former guest star Mark Hamill leads celebrities and fans bidding farewell to hit sitcom on Twitter

He once played himself in an episode of the hit CBS sitcom.

And Mark Hamill has paid tribute to The Big Bang Theory on the day of its final episode, in a tweet.

Taking to his popular social media account, the 67-year-old signed off the tweet, 'Your fan, Bark Hamill,' a reference to the name of the actor's lost dog in his season 11 episode. 

Big fan: Mark Hamill has paid tribute to The Big Bang Theory on the day of its final episode, in a tweet

Big fan: Mark Hamill has paid tribute to The Big Bang Theory on the day of its final episode, in a tweet

The Star Wars actor's full tweet read: 'Congratulations @bigbangtheory for 12 history-making years of laughter, elevating nerd-culture to unimagined new heights & triggering countless folks to ask me if I would please officiate at their weddings.'

This was a reference to his episode's storyline, which concerned Mark officiating Sheldon't wedding as a reward for another character finding his dog, Bark. 

Plenty of other fans took to social media to share their own tributes to the show as it ended after a 12 year run. 

Memorable: Taking to his popular social media account, the 67-year-old signed off the tweet, 'Your fan, Bark Hamill,' a reference to the name of the actor's lost dog in his season 11 episode

Memorable: Taking to his popular social media account, the 67-year-old signed off the tweet, 'Your fan, Bark Hamill,' a reference to the name of the actor's lost dog in his season 11 episode

LOL: This was a reference to his episode's storyline, which concerned Mark officiating Sheldon't wedding as a reward for another character finding his dog, Bark

LOL: This was a reference to his episode's storyline, which concerned Mark officiating Sheldon't wedding as a reward for another character finding his dog, Bark

However not all were complimentary, including New York Times writer Wajahat Ali. 

'The only time I saw the #bigbangtheory was on airplanes when there was nothing else to watch,' began the journalist. 

'I never laughed and I never understood why it was a big hit. That being said, I dig all the actors and congrats on an epic run.' 

Not a fan: However not all were complimentary, including New York Times writer Wajahat Ali

Not a fan: However not all were complimentary, including New York Times writer Wajahat Ali

Winnie! Another tribute came from one time actress on the show, Danica McKellar

Winnie! Another tribute came from one time actress on the show, Danica McKellar

Another tribute came from one time actress on the show, Danica McKellar.

The star of classic TV drama The Wonder Years played Raj Koothrappali's 'love interest' in one episode of the sitcom.

The 44-year-old actress wrote, '#tbt to my episode in 2009, when I played Koothrappali's love interest.'

 'Wishing everyone involved in #tbbt a *wonderful* finale! And a big thank you for so many years of laughs...and science.' 

Other fans were glowing in their praise of the last episode of the show that made actors like Jim Parsons and Kaley Cuoco household names

Other fans were glowing in their praise of the last episode of the show that made actors like Jim Parsons and Kaley Cuoco household names

Other fans were glowing in their praise of the last episode of the show that made actors like Jim Parsons and Kaley Cuoco household names.

'The best finale ever #BigBangTheory hands down. Goodbye to a great show,' wrote one Twitter user.

Many others called out the fixed elevator scene, itself a payoff of a long-running Big Bang Theory gag about the building's permanently broken lift.

'Is it normal to cry over a fixed elevator? Asking for a friend,' wrote @huskerkas. 

Many others called out the fixed elevator scene, itself a payoff of a long-running Big Bang Theory gag about the building's permanently broken lift

Many others called out the fixed elevator scene, itself a payoff of a long-running Big Bang Theory gag about the building's permanently broken lift

After 12 years on air, The Big Bang Theory is officially coming to an end tonight. 

But the cast of the hit comedy series are still saying their emotional goodbyes to the show. 

Kaley Cuoco, 33, began the farewells over social media, posting a photo of the show's stars taking their final bow. 

Going out with a Big Bang! Kaley Cuoco, 33, began the farewells over social media, posting a photo of the cast taking their final bow

Going out with a Big Bang! Kaley Cuoco, 33, began the farewells over social media, posting a photo of the cast taking their final bow

'FINAL BOWS TONIGHT,' she captioned the photo.

She also posted a sneak peek photo from the finale, an image of her and Jim Parsons 'not paying attention' inside their iconic apartment.   

'A final "not paying attention" shot from tonight's @bigbangtheory_cbs finale! #findyourlens,' she captioned the photo. 

She even posted a photo from her 'last supper with my tv family,' a snap of the cast laughing and having a good time over dinner.  

Strike a pose: The actress at the finale party for her show earlier this month

Strike a pose: The actress at the finale party for her show earlier this month 

Caught them off guard! Cuoco captioned a snap of her with co-star Jim Parsons, 'A final "not paying attention" shot'

Caught them off guard! Cuoco captioned a snap of her with co-star Jim Parsons, 'A final "not paying attention" shot' 

Feast with the TV family: Cuoco shared a photo from her 'last supper' with the cast

Feast with the TV family: Cuoco shared a photo from her 'last supper' with the cast

Grape toss! Johnny Galecki posted photos from his final scene with Kaley, who plays his wife Penny

Grape toss! Johnny Galecki posted photos from his final scene with Kaley, who plays his wife Penny 

The stars have been going through an array of emotions as they process the end of their series, and Kaley even compared the finale to a 'death.' 

'It was kind of like a death, in a way,' she admitted during a Thursday appearance on CBS This Morning with co-star Johnny Galecki.  'It's been a long, long time together.'

'Someone came up to me the other day, and I think she was like 10, "I love the show!" I was like, "Oh when did you start watching?" She was like, "Well it started before I was born." And I was like,' she said, giving a frowning expression.  

Setting the scene: The co-stars took a breather from filming

Setting the scene: The co-stars took a breather from filming

Emotional: The pair shared a tight embrace as they filmed their last scene together

Emotional: The pair shared a tight embrace as they filmed their last scene together 

Johnny also posted a photo from his very last scene with Kaley, who plays his wife Penny. 

'Filming Leonard's & Penny's last scene. @kaleycuoco (Throwing grapes at photographers is a favorite pastime.),' he captioned the photo. 

In the photos, Johnny playfully tossed a grape towards the photographer, before pulling his co-star in for a tight embrace. 

Bazinga! Parsons posted a photo of the cast in a group hug after filming their final scene all together

Bazinga! Parsons posted a photo of the cast in a group hug after filming their final scene all together 

Jim Parsons, who plays fan favorite Sheldon Cooper, shared a photo of the cast locked in a group hug after filming their final scene together. 

'It was really hard to pick the right pic for this post, so here is a shot of us in a hug after we filmed the last group scene we would ever film for the series... and TONIGHT is THE NIGHT... it's the series finale at 8pm EST and then there's the Young Sheldon (season!) finale, and then a special behind the scenes show hosted by @kaleycuoco and @sanctionedjohnnygalecki and then the entire cast is on @colbertlateshow I hope you get a chance to tune in and i hope you enjoy all of it. 

'If you enjoy it even half as much as we've enjoyed (LOVED) creating this show for the past 12 years, then that'll be a WHOLE WHOLE lot of enjoyment. All of us will miss seeing you in this format, but we will be around in all sorts of ways, I assure you... love love love.'

Lights, camera, action! Melissa Rauch posted photos from her very first day playing Bernadette Rostenkowski

Lights, camera, action! Melissa Rauch posted photos from her very first day playing Bernadette Rostenkowski

Fancy! The actress said she couldn't believe she would be getting her very own dressing room

Fancy! The actress said she couldn't believe she would be getting her very own dressing room

Group photo! Mayim Bialik kept her tribute short and sweet as she wrote, 'Oy. The emotions'

Group photo! Mayim Bialik kept her tribute short and sweet as she wrote, 'Oy. The emotions' 

Kunal Nayyar, who plays Raj Koothrappali, shared a the same snap as Kaley from their recent cast dinner, calling it 'heaven.'

'Where you at nyc? #love,' he wrote. 

Melissa Rauch posted a series of cast photos taken over the years, along with a throwback from her very first day playing  Bernadette Rostenkowski. 

'Every heart expanding adventure begins with a single step. This was mine for @bigbangtheory_cbs... My first episode. Or my first "step-isode" ~ if you will. The second pic is shortly after I joined the cast (I couldn’t believe I had my very own dressing room)! The friendships and memories that would build from these moments simply overwhelm me.' 

Hugs: The cast shared an embrace beside the perpetually broken elevator

Hugs: The cast shared an embrace beside the perpetually broken elevator 

Aww! Bialik alongside her on-screen husband, Parsons

Aww! Bialik alongside her on-screen husband, Parsons 

Mayim Bialik, who plays Amy Farrah Fowler, kept her message short and sweet.

'Oy. The emotions,' she wrote, along with flashback photos from the set. 

The Big Bang Theory premiered in 2007 and followed the lives of a group of scientist friends working at Caltech. 

The long-running series was the recipient of numerous awards, and made Jim the winner of the Emmy for Outstanding Lead Actor In A Comedy Series multiple times. 

The final episode of The Big Bang Theory airs on CBS tonight at 8/7c. 

A strong bond: The cast and crew watched the final scene of The Big Bang Theory together

A strong bond: The cast and crew watched the final scene of The Big Bang Theory together

They have chemistry! The Big Bang Theory premiered in 2007 and followed the lives of a group of scientist friends working at Caltech

They have chemistry! The Big Bang Theory premiered in 2007 and followed the lives of a group of scientist friends working at Caltech

 

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The Big Bang Theory finale: Mark Hamill bids farewell on Twitter

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