Mayim Bialik as Amy Farrah Fowler
Mayim Bialik joined the cast of The Big Bang Theory as Amy just in time for the guys to set up a dating profile for Sheldon. Amy was a neurobiologist—a degree that Mayim holds in real life. The pair ended up being a perfect match for one another.
Kate Micucci as Lucy
Lucy, played by actress Kate Micucci, first met Raj a singles event at Stuart's comic book store. Similarly to Raj, Lucy suffered from severe social anxiety. She would often run out in the middle of their dates, overwhelmed with fear.