Katie Leclerc is taking a guest role on the CBS show The Big Bang Theory which returns with new episodes later this month. The actress who stars as Daphne on the ABC Family show Switched at Birth will appear in the fourth episode of the upcoming Big Bang season which is set to air October 6. She will play the role of Emily, who is deaf and will be a love interest for the love-challenged scientist Raj (Kunal Nayyar).