Alice Amter plays Mrs. Koothrappali.
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The Big Bang Theory episode where Sheldon Cooper plays the theremin is entitled The Bus Pants Utilization.
Melissa Rauch plays Howard's wife on The Big Bang Theory.
Carol Ann Susi plays Howard's mom on The Big Bang Theory, tho she is never seen. We only hear her voice.
Siri was played by Becky O'Donohue.
Priya is portrayed by Aarti Mann