<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>

Who has played amy farrah fowler's mother