The main storyline begins when Sheldon and Leonard run into at a drug store. Conflict arises when Arthur emails Leonard to collaborate on a research paper about vacuum nanoelectronics instead of Sheldon, whom Arthur finds incredibly annoying.
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 [S7E7] The Proton Displacement
: Arthur Jeffries' character mentions that Bill Nye "stole" his show, a humorous reference to the real-life influence of scientific edutainment pioneers like Don Herbert (Mr. Wizard) on later shows. The Proton Displacement | The Big Bang Theory Wiki | Fandom The main storyline begins when Sheldon and Leonard
: This episode adds Bill Nye to the long list of celebrities who have filed restraining orders against Sheldon, including Leonard Nimoy, Stan Lee, and Carl Sagan. Bill Nye : Appears as himself in a cameo role
: 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.