Ramona works at Caltech as a postdoctoral researcher and is a big fan of Sheldon and his work. She meets him in the cafeteria, and they arrange to have dinner at his apartment.
His friends feel that she is a bit obsessive, but Sheldon just appreciates that he’s getting free dinner. During their date, the rest of the gang sits on the couch as onlookers of this strange turn of events. Eventually, Sheldon solves the problem that he’s working on, and Ramona wants to share credit for it. He reacts by kicking her out of the apartment.
Brooke D’Orsay as Christy Vanderbel – Then
Christy is a former friend of Penny from Nebraska who was engaged to Penny’s cousin while sleeping with Penny’s brother Randall. Penny thinks of her as a family member and lets her stay with her for a short time.
Christy hooks up with Howard in Penny’s room and drives Penny out of her own apartment. Christy is very materialistic, and she goes out with Howard under the condition that he buys her stuff. After confronting Howard’s mother, who threatens to take Howard out of his will if they keep dating, she dumps him.
Brooke D’Orsay as Christy Vanderbel – Now
Brooke has acted in multiple series since her role as Christy in TBBT. She acted as Heather Hanson in the comedy series "Happy Hour." She also was in an episode of "How I Met Your Mother." She was the voice of Caitlin in the animated series "6Teen" for 86 episodes.
She played two different characters in "Two and a Half Men" — in 2007, she played Robin, and in 2014, she played Kate. Later, she played the role of Paige Collins in the show "Royal Pains." Her last two gigs were minor parts in TV movies.
Riki Lindhome as Ramonda Nowitzki – Now
Riki’s most well-known roles are in the movies "Million Dollar Baby" and "The Last House on the Left." She has played Beatrice in the historical comedy series "Another Period" from 2013 to 2018. She also was the voice of the character Poison Ivy in the newest "Lego Batman Movie."
The actress also acted in a thriller movie called "Under the Silver Lake," alongside Andrew Garfield and Riley Keough (Elvis’s granddaughter).
Eliza Dushku as Angela Page – Then
Angela is an FBI agent who does a background check on Howard when he needs a security clearance to be on the Defense Department Equipped Surveillance Satellite Team.
When she interviews Raj about Howard, Raj is paranoid and only talks about himself, sharing with her that he is definitely legal in the U.S. Then, Leonard hits on her but learns that she is married to a Navy Seal. When Angela interviews Sheldon, he accidentally tells her that Howard once crashed the Mars rover to try and impress a girl. Needless to say, Howard didn’t pass the security clearance to be on the team.