Assertion: big bang theory's character | /r/HasProperty | promoted to main cast
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text: The fourth season added two new female characters in semi-regular roles, who would eventually be promoted to the main cast: Dr. Bernadette Rostenkowskinote (Melissa Rauch), a sweet-hearted microbiologist who is introduced as Penny's friend and co-worker, and soon formed a relationship with Howard; and Dr. Amy Farrah Fowlernote (Mayim Bialik), a Distaff Counterpart to Sheldon who gradually became best friends with Penny and eased out of her neurotic shell.