'The Big Bang Theory': All The Best Guest Stars

1 / 15

Carrie Fisher

While it was a short cameo, the late Carrie Fischer appeared in season seven of The Big Bang Theory as herself. We got to see an angry Carrie welding a baseball belt when "Sheldon" and this next guest star show up at her home to play ding-dong ditch...

2 / 15

James Earl Jones

When "Sheldon" runs into Star Wars legend James Earl Jones at Jones' favorite Sushi restaurant, the two bond instantly and embark on a night of adventures, including pranking Carrie Fisher. While they have a good time together, "Sheldon" gets increasingly bored by Jones' stories.

3 / 15

Octavia Spencer

Academy Award-winning actress Octavia Spencer also appears on a season two episode of The Big Bang Theory. In the role of a DMV worker, Octavia isn't quite thrilled with "Sheldon's" endless questions as he attempts to get his learner's permit.

4 / 15

George Takei

One of The Big Bang Theory's best guest stars would come in season four's fourth episode, "The Hot Troll Division." Appearing in a fantasy of "Howard's", Star Trek legend George Takei attempts to give "Howard" and "Bernadette's" relationship advice with the help of this next guest star...

5 / 15

Katee Sackhoff

Battlestar Galactica star Katee Sackhoff appears alongside George Takei in "Howard's" fantasy world. Katee questions both men, suggesting "Howard" may have "latent homosexual tendencies" and questioning George's place to offer advice.

6 / 15

Elon Musk

Referenced frequently in The Big Bang Theory, it was only natural for the SpaceX founder to make his appearance on the show. In the episode, "The Platonic Permutation", "Howard" finally meets his personal hero when they serve the homeless Thanksgiving dinner together.

7 / 15

Billy Bob Thornton

Billy Bob Thornton would give his mom the best present in 2014 when he guest-starred in season eight of The Big Bang Theory as "Dr. Oliver Lorvis". Thornton's mom, a longtime fan of the series, was just as thrilled as fans to see Thornton on the show!

8 / 15

Buzz Aldrin

Even space legend Buzz Aldrin has guest-starred on the Emmy-winning series! "Howard", a longtime fan of Buzz Aldrin, mentions the space legend numerous times throughout the series, and in season six, episode five Buzz makes a surprise appearance at the end handing out Halloween candies to children.

9 / 15

Neil deGrasse Tyson

Astrophysicist Neil deGrasse Tyson has guest-starred in not just one but two episodes of The Big Bang Theory. Well-known because of his involvement with the demotion of Pluto as a planet, when "Raj" introduces Tyson to "Sheldon" in season four, "Sheldon" is not a fan.

10 / 15

Danica McKellar

Mathematician and actress Danica McKellar was an early guest star of The Big Bang Theory. Playing the part of "Abby", Danica appears in season three's episode, "The Psychic Vortex" when "Raj" and "Sheldon" meet her at a university mixer.

The Big Bang Theory guest stars over the years have ranged from TV legends like George Takei to real-life scientists including Neil deGrasse Tyson. Do you remember all of the amazing guest stars? Join us in taking a look at some of The Big Bang Theory's best guest stars over the years!

The Big Bang Theory Guest Stars

One of The Big Bang Theory's best guest stars would come in season four's fourth episode, "The Hot Troll Division." Appearing in a fantasy of "Howard's", Star Trek legend George Takei attempts to give "Howard" and "Bernadette's" relationship advice.

Which Big Bang Theory guest star was your favorite?