<Li> Halley Wolowitz (Pamela Adlon, voice only), Howard and Bernadette's baby daughter, born in the episode "The Birthday Synchronicity". Halley's appearances are hidden by her baby pram and covered up by blankets, though her loud cries from off - screen sound a lot like Mrs. Wolowitz (a tribute to Carol Ann Susi). </Li> <Li> Neil Michael Wolowitz, Howard and Bernadette's baby son, born in the episode "The Neonatal Nomenclature". Hours before his birth, Howard is unhappy that Bernadette has already decided to name the baby after her father, Michael, without consulting him first . He doesn't agree with this and is even more disturbed that many of the names he has thought of come from her ex-boyfriends in college . Eventually Howard and Bernadette compromise as she gives birth to Neil, after Neil Armstrong and Neil Diamond, with Michael as the middle name . Bernadette still wants to call the baby Michael as a nickname, and Howard doesn't argue with her because of the baby's large head . </Li> <Ul> <Li> Abby (Danica McKellar) and Martha (Jen Drohan): two ladies that Raj and Sheldon meet at a university mixer . Abby takes a liking to Raj and Martha takes a liking to Sheldon . While Raj is welcoming of Abby's moves, Sheldon is rejective of Martha's moves . </Li> <Li> Alice (Courtney Ford): an attractive comic book enthusiast whom Leonard meets after Priya moves back to India . Meeting Alice triggers a chain of events which ends with Leonard and Priya breaking up . </Li> <Li> Mandy Chao (Melissa Tang): a colleague of Leonard at the university who made out with him once when they were both drunk . The incident, which happened prior to Leonard's marriage to Penny, almost sabotages the marriages after Leonard tells Penny about it . </Li> <Li> Chen (James Hong): a maitre d' at a Chinese restaurant that the guys eat at . </Li> <Li> Professor Crawley (Lewis Black): a former entomologist at the university with whom Sheldon, Howard, and Raj confer about a cricket . </Li> <Li> Issabella Maria Concepcion (Maria Canals - Barrera) a Cuban - American janitor working in Raj's telescope building whom Raj wants to date . </Li> <Li> Kenny Fitzgerald (Michael Rapaport): an intelligent thief who sells stolen liquid helium to Leonard and Sheldon . He later strikes up a friendship with the duo and they watch Ernest Goes to Jail together . </Li> <Li> Mrs. Fowler (Annie O'Donnell; Kathy Bates): Amy's mother, who is played by Annie O'Donnell in "The Desperation Emanation", and by Kathy Bates in "The Bow Tie Asymmetry". </Li> <Li> Dr. Gallo (Jane Kaczmarek): a therapist to whom Penny attempts to sell products . She winds up conducting therapy on both Penny and Leonard . </Li> <Li> Mrs. Latham (Jessica Walter): a donor for the university who goes out on two dates with Leonard . </Li> <Li> Toby Loobenfield (DJ Qualls): a scientist at CalTech whom Sheldon hires to play his fictional drug - addicted cousin Leo . </Li> <Li> Dr. Oliver Lorvis (Billy Bob Thornton): a medical doctor to whom Penny sells products . He misreads her flirtations and locks the guys in his basement while he goes to woo her (as well as Amy and Bernadette). </Li> </Ul> <Li> Abby (Danica McKellar) and Martha (Jen Drohan): two ladies that Raj and Sheldon meet at a university mixer . Abby takes a liking to Raj and Martha takes a liking to Sheldon . While Raj is welcoming of Abby's moves, Sheldon is rejective of Martha's moves . </Li>

Who plays amy farrah fowler's mother on big bang