If you're a fan of The Big Bang Theory or sitcom cameos, this list of guest stars on the show over the years will make you reminisce. Not only does the show deliver laughs, but it also delivers high profile actors, celebs, and geek icons seemingly on a weekly basis.
Check out these 19 Big Bang cameos below...
1. Bill Nye
Episode: "The Proton Displacement" Season 7, Episode 7
Why this was a good cameo: Bill Nye the Science Guy is a world renowned scientist and celebrity, so yeah, good choice for a cameo.
2. Buzz Aldrin
Episode: "The Holographic Excitation" Season 6, Episode 5
Why this was a good cameo: He went to space. Nuff said.
3. Steve Wozniak
Episode: "The Cruciferous Vegetable Amplification" Season 4, Episode 2
Why this was a good cameo: Woz was Steve Jobs' right-hand man and the nuts-and-bolts guy behind the creation of Apple. He deserves this.
4. Charlie Sheen
Episode: "The Griffin Equivalency" Season 2, Episode 4
Why this was a good cameo: Chuck Lorre probably tapped Sheen from Two and a Half Men for this cameo, but it's good regardless. You can never go wrong with a Charlie Sheen guest appearance.
5. Neil deGrasse Tyson
Episode: "The Apology Insufficiency" Season 4, Episode 7
Why this was a good cameo: Neil deGrasse Tyson has become somewhat of a legend in the scientific world - and just in general as well - especially with the release of his show, Cosmos. His thought leadership is incredibly strong and real.
6, 7. George Takei and Katee Sackhoff
Episode: "The Hot Troll Deviation" Season 4, Episode 4
Why these two were good: George Takei is a massive social media superstar at this point and Katee Sackhoff carries her own fan-base to the show as well.
8. Summer Glau
Episode: "The Terminator Decoupling" Season 2, Episode 17
Why this was a good cameo: The nod to the Sarah Connor Chronicles and an entire Terminator theme to the episode is perfect.
9. Brent Spiner
Episode: "The Bakersfield Expedition" Season 5, Episode 5
Why this was a good cameo: I actually got a chance to meet this man on the set of the second Independence Day film. He was nice. That's why I think this cameo was good.
10. Stan Lee
Episode: "The Excelsior Acquisition" Season 3, Episode 16
Why this was a good cameo: Marvel.
11. & 12. James Earl Jones and Carrie Fisher
Episode: "The Convention Conundrum" Season 7, Episode 14
Why this was a good cameo: There has to be a considerable amount of crossover in the Star Wars fandom and TBBT.
13. Bob Newhart
Episodes: "The Proton Resurgence," "The Proton Displacement," "The Proton Transmogrification" Seasons 6 and 7
Why this was a good cameo: Not even sure if this necessarily qualifies as a cameo since he had repeat performances, but he's the man regardless so I decided to include him on the list.
14. Leonard Nimoy (R.I.P.)
Episode: "The Transporter Malfunction" Season 5, Episode 20
Why this was a good cameo: May Spock forever Rest in Peace.
15. Stephen Hawking
Episode: "The Hawking Excitation" Season 5, Episode 21
Why this was a good cameo: Dedicating an entire episode to potentially one of the smartest humans on the planet is never a bad move.
16. Judy Greer
Episode: "The Plimpton Stimulation" Season 3, Episode 21
Why this was a good cameo: Classic actress and, as you may have noticed, a lot of these cameos skewed towards male performances. Good to see some ladies representing!
17. Nathan Fillion
Episode: "The Comic Book Store Regeneration" Season 8, Episode 15
Why this was a good cameo: The Castle actor was a good fit for the show.
18. Brian Greene
Episode: "The Herb Garden Germination" Season 4, Episode 20
Why this was a good cameo: Brainiac.
19. Jessica Walter
Episode: "The Benefactor Factor" Season 4, Episode 15
Why this was a good cameo: She brought a different style of humor and sternness that worked perfectly on the show.