Name: Charlie Sheen
Appears in: "The Griffin Equivalency" (2 × 04)
The role: himself
Biography in Brief: Charlie Sheen is an American actor. He won a Golden Globe and was nominated for Emmy Awards. Among his most famous works "Scary Movie 3", "Platoon" and "Two and a Half Men."
Name: Sara Rue
Appears in: "The Lizard Spock-Expansion (2 × 08)," The White Asparagus Triangulation "(2 × 09)," The Conundrum Vartabedian "(2 × 10)
Role of: Stephanie Barnett
Biography in Brief: Sara Rue is an American actress. Among his most famous works are "Than Perfect," "Popular" and "Will & Grace."
Name: Michael Trucco
Appears in "The Bath Gift Item Hypothesis" (2 × 11)
In the role of Dr. David Underhill
Biography in Brief: Michael Trucco is an American actor. Among his most famous roles include Samuel Anders ("Battlestar Galactica") and Lee Cooper ("One Tree Hill").
Name: Summer Glau
Appears in "The Terminator Decoupling" (2 × 17)
The role: herself
Biography in Brief: Summer Glau is an American actress. She is known for having starred as River Tam in the series "Firefly" and the role of Cameron in the series "Terminator: The Sarah Connor Chronicles." He was also a member of the cast of the series "Dollhouse."
Name: George Smoot
Appears in "The Terminator Decoupling" (2 × 17)
The role: himself
Biography in Brief: George Smoot is an American astrophysicist and cosmologist. He won the Nobel Prize for Physics in 2006 shared with John C. Mather for the discovery of the blackbody anisotropies in the cosmic microwave background by COBE (Cosmic Background Explorer). Their findings reinforced the Big Bang theory.
Name: Wil Wheaton
Appears in: "The Creepy Candy Coating Corollary" (3 × 05), "The Wheaton Recurrence" (3 × 19)
The role: himself
Biography in Brief: Wil Wheaton is an actor. Among his most famous works include "Star Trek: The Next Generation" and "Stand by Me - I remember one summer."
Name: Katee Sackhoff
Appears in: "The Vengeance Formulation" (3 × 09)
The role: herself
Biography in Brief: Katee Sackhoff is an 'actress. Among his most famous works are "24" and "Battlestar Galactica" where she played the role of Captain Kara "Starbuck" Thrace, which has enabled it to win a Saturn Award for Best Actress in a Television Series.
Name: Danica Mckellar
Appears in: "The Psychic Vortex" (3 × 12)
In the role of Abby
Biography in Brief: Danica Mae McKellar is an American and mathematics (the same as the Chayes-McKellar-Winn theorem), known for playing Winnie Cooper in "The Wonder Years" and for having written two bestsellers, "Math Does not Suck "and" Kiss My Math, which helps young people to approach the study of mathematics. She graduated with honors in mathematics at UCLA.
Name: Stan Lee
Appears in: "The Excelsior Acquisition" (3 × 16)
The role: himself
Biography in Brief: Stan Lee is a famous cartoonist, who created legendary characters such as Spiderman, the Fantastic Four Iron Man, Daredevil and the X-Men.
Name: Judy Greer
Appears in: "The Plimpton Stimulation" (3 × 21)
In the role of Dr. Elizabeth Plimpton
Biography in Brief: Judy Greer is a 'actress, known for her role as Three Kings, 30 years in a second and 27 Dresses.
Name: Mayim Bialik
Appears in: "The Lunar Excitation" (3 × 23)
In the role of Amy Fowler
Biography in Brief: Mayim Bialik is an American actress, known to the general public for the character in the television series Blossom.
