![Big Bang Theory: What happened to Professor Proton? Why did he leave? | TV & Radio | Showbiz & TV | Express.co.uk Big Bang Theory: What happened to Professor Proton? Why did he leave? | TV & Radio | Showbiz & TV | Express.co.uk](https://cdn.images.express.co.uk/img/dynamic/20/590x/secondary/Big-Bang-Theory-Bob-Newhart-2173264.jpg?r=1574185914261)
Big Bang Theory: What happened to Professor Proton? Why did he leave? | TV & Radio | Showbiz & TV | Express.co.uk
![Big Bang Theory: What happened to Professor Proton? Why did he leave? | TV & Radio | Showbiz & TV | Express.co.uk Big Bang Theory: What happened to Professor Proton? Why did he leave? | TV & Radio | Showbiz & TV | Express.co.uk](https://cdn.images.express.co.uk/img/dynamic/20/590x/secondary/Big-Bang-Theory-Arthur-would-appear-in-Sheldon-s-imagination-2173265.jpg?r=1574185914407)
Big Bang Theory: What happened to Professor Proton? Why did he leave? | TV & Radio | Showbiz & TV | Express.co.uk
![Big Bang Theory: What happened to Professor Proton? Why did he leave? | TV & Radio | Showbiz & TV | Express.co.uk Big Bang Theory: What happened to Professor Proton? Why did he leave? | TV & Radio | Showbiz & TV | Express.co.uk](https://cdn.images.express.co.uk/img/dynamic/79/183x122/1204652_1.jpg)
Big Bang Theory: What happened to Professor Proton? Why did he leave? | TV & Radio | Showbiz & TV | Express.co.uk
![Big Bang Theory: What happened to Professor Proton? Why did he leave? | TV & Radio | Showbiz & TV | Express.co.uk Big Bang Theory: What happened to Professor Proton? Why did he leave? | TV & Radio | Showbiz & TV | Express.co.uk](https://cdn.images.express.co.uk/img/dynamic/20/590x/Big-Bang-Theory-What-happened-to-Professor-Proton-1206510.jpg?r=1574185908889)