I Guest Starred on "The Big Bang Theory" Quiz

Answer:

James Earl Jones appeared as himself on "The Convention Conundrum"(s7,ep14). James and Sheldon met at a sushi restaurant and continued to hang out together culminating in a ding dong ditch at Carrie Fisher's house.

Stan Lee appeared as himself in "The Excelsior Acquisition" (s3,ep16) when Penny took Sheldon to meet Stan Lee at his house. When Stan Lee sarcastically invited Sheldon into his house, Sheldon took him seriously. This is the reason Sheldon has a restraining order signed by Stan Lee.

Wil Wheaton first appearance as himself was in "The Creepy Candy Coating Corollary"(s3,ep5). When Wil was first introduced in the series, Sheldon considered him a nemesis because Wil never showed up for a personal appearance when Sheldon was younger. Wil appeared in seventeen episodes of "The Big Bang Theory" going from Sheldon's nemesis to friend to nemesis.

Neil Degrasse Tyson first appeared as himself in "The Apology Insufficiency"(s4,ep7). Raj introduced him to Sheldon in the hallway at the University and Sheldon blames Tyson for demoting Pluto. Neil Degrasse Tyson would later make a brief appearance in "The Conjugal Configuration"(s12,ep1).

Bill Gates appeared as himself in "The Gates Excitation" (s11,ep18) with Penny showing him around the pharmaceutical company where she worked.

Mark Hamill appeared as himself in "The Bow Tie Asymmetry" (s11,ep24) when Howard found Mark's dog and asked him to officiate Sheldon and Amy's wedding. The name of the dog, Bark Hamill, was chosen by fans of the series.

Kathy Bates appeared for the first time in "The Bow Tie Asymmetry" (s11,ep24) as Amy's mom, Mrs. Fowler. Kathy is the second woman to play Mrs. Fowler. Annie O'Donnell originally played Mrs. Fowler in a video chat with Amy for the episode "The Desperation Emanation" (s4,ep5).

Summer Glau appeared as herself in "The Terminator Decoupling" (s2,ep17). Leonard, Raj, and Howard tried to impress her while they were all traveling on a train to San Francisco.

Katee Sackhoff appeared for the first time as a fantasy version of herself in "The Vengeance Formulation"(s3,ep9). Howard fantasized about Katie Sackhoff being in the bathtub with him. She reminded Howard that Bernadette was real while she was just his fantasy.

Billy Bob Thornton appeared as a customer of Penny's named Dr. Oliver Lorvis in "The Misinterpretation Agitation"(s8,ep7). Doctor Lorvis believed Penny had feelings for him and locked the guys in his game room so he could spend time with Penny. FYI, the original Mrs. Fowler, Annie O'Donnell, voiced Oliver Lorvis's mother.

Rick Fox appeared as Glen in "The Love Car Displacement"(s4,ep13). Glenn was a former boyfriend to Bernadette that Howard met for the first time.

Sarah Michelle Gellar appeared as herself in "The Stockholm Syndrome (s12,ep24)". She acted as Raj's "date" to the Nobel Prize ceremony.

June Squibb appeared as Constance "MeeMaw" Tucker in "The MeeMaw Materialization" (s9,ep14). She was against Sheldon giving Amy an engagement ring because of Amy breaking up with Sheldon.

Jessica Walters appeared as Mrs. Latham, a University benefactor, who seduced Leonard in "The Benefactor Factor" (s4,ep15).

Christopher Lloyd appeared as Theodore in "The Property Division Collision" (s10,ep10). Sheldon rented his room out to Theodore for one dollar as a way to get back at Leonard for keeping items that Sheldon wanted to keep in the apartment he was sharing with Amy.