Bernadette Rostenkowski-Wolowitz

Bernadette (Melissa Rauch) is a waitress paying her way through graduate school microbiology studies and was introduced to Howard via Penny. She has currently been dating Howard since Episode 5 of Season 3 The Creepy Candy Coating Corollary and has appeared in 4 episodes.

In the first, she and Howard did not get along on their date, as they appeared to have nothing in common. However, when they found out they both had overbearing mothers they immediately felt a connection. 4 Episodes later she returned in The Vengeance Formulation. After she decides she wants a commitment, Wolowitz decides (following from words from a pretend Katee Sackhoff) that he wants to marry her. She refuses, calling him insane, but he wins her back with his own rendition of 'Bernadette' by The Four Tops.

In The Gorilla Experiment, she becomes interested in Leonard's work, and after Leonard invites her to an experiment Wolowitz confronts him. Later Leonard passes this to Bernadette as she and Howard are making out, and later on the make up. Her most recent appearance was in The Psychic Vortex where she and Wolowitz went on a double date with Leonard and Penny. After the latter get in a fight, she declines the invitation to help them out. Also, when the waiter comes around and asks how everything is, she replies, 'Really uncomfortable.' She briefly appears in The Einstein Approximation.

Howard talks with her by phone at the beginning of The Large Hadron Collision and he talks about their Valentine's date but she doesn't appear in this episode nor int he next ones. She is not even cited until The Plimpton Stimulation in which Howard reveals that he and Bernadette broke up a few weeks ago after he was invited to participate in a threesome with Elizabeth Plimpton and Raj. He claims that he did not tell anyone because he was waiting for the right time.