Displacement | [s7e7] The Proton

The full cast for this episode features the series regulars and two notable guest stars: : Returns as Arthur Jeffries (Professor Proton). Bill Nye : Appears as himself in a cameo role. Johnny Galecki : Leonard Hofstadter. Jim Parsons : Sheldon Cooper. Kaley Cuoco : Penny. Simon Helberg : Howard Wolowitz. Kunal Nayyar : Rajesh Koothrappali. Mayim Bialik : Amy Farrah Fowler. Melissa Rauch : Bernadette Rostenkowski. Scientific and Trivia Highlights

: Meanwhile, Raj joins the "girls' night" with Penny, Amy, and Bernadette to make jewelry. Howard crashes the evening, using his high-tech tools to "improve" their crafts, which upsets Raj, who feels his safe space for expressing his feminine side is being invaded. Cast and Key Guest Stars [S7E7] The Proton Displacement

: Sheldon is seen wearing a Sinestro Corps (Yellow Lantern) shirt, which symbolizes "fear"—a nod to the tension in his relationship with Arthur during the episode. The full cast for this episode features the