Bob Newhart as Professor Proton or Arthur Jeffries
Professor Proton, whose real name is Arthur Jeffries, is a recurring character in Big Bang Theory. He is a former children’s television host who becomes Sheldon’s personal hero. Sheldon idolizes the Professor for his scientific knowledge and achievements. Despite being retired, the Professor appears to Sheldon as a ghostly figure, offering him advice on various aspects of his life. However, Sheldon’s admiration for the Professor leads to a somewhat rocky relationship, as the Professor sometimes finds Sheldon’s behavior and attitude frustrating. The character of Professor Proton serves as a mentor and role model for Sheldon, inspiring him to pursue his passions in science and acting as a source of guidance throughout the series.