ByJared Ficiur, writer at Creators.co
Jared Ficiur

The Big Bang Theory has become one of the most popular shows on television! We've been lucky enough to get nine seasons with Leonard, Penny, Sheldon, Wolowitz, Amy, Raj and Bernadette! How big of a fan are you? Have you caught all of these delicious cameos where celebrities portrayed themselves in often ridiculous ways? You may be surprised at how many incredibly iconic people have popped up on one of TV's greatest sitcoms!

1. Charlie Sheen

Season 2, Episode 14: The Griffin Equivalency

During his run on Two and a Half Men Sheen popped up with a single line in The Big Bang Theory. The episode revolved around Raj's arrogance when he discovers a previously unknown object in space and he's interviewed by People magazine for their "30 Under 30 to Watch."

2. Summer Glau

Season 2, Episode 17: The Terminator Decoupling

Glau is another actress from the beloved, short-lived show Firefly, but also the short-lived television show Terminator: The Sarah Connor Chronicles, as well as Dollhouse, Alphas, and Arrow. In the episode the guys are taking a train to northern California and run into her as they argue over who gets to hit on her first!

3. Stan Lee

Season 3, Episode 16: The Excelsior Acquisition

Stan Lee is the King of cameos! He's been hidden in almost every Marvel film that has been produced! He was even portrayed as a cartoon character in Disney's Big Hero 6. His short appearance in The Big Bang Theory is wonderful! Sheldon missed his opportunity to meet Stan Lee at a signing, so he and Penny go on an adventure to Lee's home. There they find him in his Fantastic Four bathrobe late at night and Sheldon makes things especially awkward for all three!

4. Katee Sackoff

Season 3 Episode 9: The Vengeance Formulation

5. Katee Sackhoff WITH George Takei

Season 4, Episode 4: The Hot Troll Deviation

Sackhoff's first appearance on Big Bang is uniquely hilarious! Just like everyone else on this list, she plays herself, but an imaginary version of herself in Howard's masturbation fantasy. She shows up in the bathtub, naked with the beloved nerd, and teases him about the ridiculousness of the fantasy.

The second time Katee appears on our show is, again, during another of Howard's masturbatory fantasies! This time she shows up in her Battlestar Galactica flight suit (which Sackhoff brought from home). Howard questions why Bernadette shows up in the fantasy when Star Trek icon George Takei shows up! Takei also brought his old Sulu costume from home! The fantasy takes a turn when Sackhoff and Takei go off on a tangent together about being typecast as science-fiction actors, and Howard's mother interrupts his activities.

6. Brent Spiner

Season 5, Episode 5: The Russian Rocket Reaction

For two years we witnessed Sheldon's feud with Star Trek alum Wil Wheaton, so when his friends were invited to Wheaton's house for a party he was naturally offended. Sheldon reluctantly went and while he and Wheaton made amends, Spiner, who Trek fans know as Mr. Data, showed up unexpectedly to take Wheaton's place on Sheldon's list!

7. Leonard Nimoy

Season 5, Episode 20: The Transporter Malfunction

Nimoy will always be remembered for bringing to life beloved Star Trek character Spock. Even though he never physically came onscreen during The Big Bang Theory, he appeared in the way of a voice-over for a dream sequence where a Spock doll talks with Sheldon! It really was an extremely clever, and unexpected way to cameo an icon like Nimoy.

8. Bill Nye

Season 7, Episode 7: The Proton Displacement

Even though Bob Newhart has been a great guest star several times on The Big Bang Theory, he doesn't make this list because he doesn't appear as himself! However, he and Bill Nye have some of the best chemistry on screen! Newhart portrays a fictional washed up old scientist who had a television show from Sheldon and Leonard's childhood, a show that apparently was very similar to Bill Nye the Science Guy, so the two scientists clash!

9. – 10. James Earl Jones AND Carrie Fisher

Season 7, Episode 14: The Convention Conundrum

Apparently before this episode of The Big Bang Theory, Fisher and Jones had never met! We all recognize Fisher as Princess (or General) Leia from her iconic role in Star Wars, and her one-liner and short appearance in The Big Bang Theory could easily be a throwaway gag, but with James Earl Jones also appearing as a large part of the episode, it makes it even more fun!

11. LeVar Burton

Season 4, Episode 17: The Toast Derivation
Season 6, Episode 7: The Habitation Configuration
Season 8, Episode 10: The Champagne Reflection

Burton is another Star Trek alumni who's appeared on The Big Bang Theory three times! Each time has been a fun and short gag! In Season 4 Sheldon attempted to throw a party without his friends and only invited celebrities via Twitter. Burton was one who was invited, and he actually showed up but left quickly after catching Stuart, Kripke, and Zack singing karaoke. In Season 6, Burton showed up as himself for a special Star Trek episode of Sheldon Cooper's Fun With Flags. Similar to the second cameo, in Season 8 he appeared in a clip show containing the "best of" Fun With Flags.

12. Nathan Fillion

Season 8, Episode 15: The Comic Book Store Regeneration

Fillion is best known to fans for his roles in Firefly, Castle and Dr. Horrible. He's no stranger to nerdy fanboys so when Leonard and Raj find him at a deli and approach him, he lies and tells him he's not the famous actor. After they get their food to go he tells them he really is Nathan Fillion, but he just wanted to eat his meal in peace. They agree to take a picture with him, but Raj makes it awkward!

13. Kevin Smith

Season 8 Episode 20: The Fortification Implementation

One of the ongoing story arcs of Season 8 is Penny and Wil Wheaton's film Serial Apeist 2: Monkey See, Monkey Kill. In this episode they record a podcast and the real Kevin Smith calls in to beg Penny to come audition for his new film!

14. Adam Nimoy

Season 9, Episode 7: The Spock Resonance

The real-life son of Leonard Nimoy appeared in a special episode of The Big Bang Theory this season as he interviewed Sheldon for a documentary he was creating based around his father's legacy. The cameo is special because the documentary is really happening, and is set to be released this year with interviews of Nimoy's former friends and costars such as William Shatner, Nichelle Nichols, George Takei, Walter Koenig, J.J. Abrams and Zachary Quinto.

15. Stephen Hawking

Season 5, Episode 21: The Hawking Excitation
Season 6, Episode 6: The Extract Obliteration
Season 7, Episode 20: The Relationship Diremption
Season 8, Episode 14: The Troll Manifestation
Season 9, Episode 17: The Celebration Experimentation

Hawking has appeared on the show a total of five times so far. He's a huge fan of the sitcom and has loved being a part of it! In the Season 5 episode, Sheldon is determined to meet Hawking when he comes the university for a lecture.

In the Season 6 episode, Sheldon and Hawking become Words with Friends buddies, until Sheldon starts wiping the floor with the famous genius. Sheldon ends up letting him win because he finds out Hawking is a sore loser, and he'd rather stay friends. The story ends in a phone call where Hawking taunts Sheldon for losing.

During Season 8, Hawking only has one line, but it's hilarious. It's after a long string of drunken voicemails from Sheldon and Hawking just says "what a jackass!"

Recently, in Season 9, during a large celebration for Sheldon's birthday, Stephen Hawking calls to give him his regards and joins in with the gang in singing "Happy Birthday."

16. Adam West

Season 9, Episode 17: The Celebration Experimentation

Most recently, on Sheldon's birthday episode of The Big Bang Theory, Sheldon's friends paid Adam West to come to his party. West is best known to fans for his work on Family Guy, and the Batman television show from the 1960s. West argues the fact that he's been the best Batman so far, and he makes some really great points!

With The Big Bang Theory currently renewed for one more season, it's tenth, it's very likely we'll see some large cameos coming in for what could possibly be a farewell season! The list of who I'd enjoy seeing on the show is endless, and the writers have said they're open to any and all celebrities as long as they can fit them into the story in a natural and fun way! Who would you like to see and why? Tell me in the comments!

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