![The Big Bang Theory Season 9 Episode 18 The Big Bang Theory Season 9 Episode 18](https://image.tmdb.org/t/p/w185/eKDvR1vYLCE08K1h0KUfHNliD8T.jpg)
The Big Bang Theory Season 9 Episode 18
Leonard, Sheldon, and Wolowitz run into problems when they file for a patent for their infinite persistence gyroscope. Also, Penny, Amy and Bernadette give Koothrappali dating advice when Emily reaches out to him after their breakup.
Serie: The Big Bang Theory
Director: Mark Cendrowski, Nikki Lorre
Guest Star: Alessandra Torresani, Jim Holmes, Laura Spencer