![The Big Bang Theory' Cast Is So Happy to Have Bob Newhart Back for the Final Season – Watch! | Entertainment Tonight The Big Bang Theory' Cast Is So Happy to Have Bob Newhart Back for the Final Season – Watch! | Entertainment Tonight](https://www.etonline.com/sites/default/files/styles/video_1920x1080/public/images/2018-10/bob_newhart_101718_0.jpg?h=dfa2475e&itok=PnE2n5ZG)
The Big Bang Theory' Cast Is So Happy to Have Bob Newhart Back for the Final Season – Watch! | Entertainment Tonight
![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
![The Big Bang Theory on Twitter: "🎶Grab your goggles, put your lab coat on, here he comes, Professor Proton!🎶 Don't miss an all-new #BigBangTheory tomorrow night at 8/7c! https://t.co/rwkQ31VLaU" / Twitter The Big Bang Theory on Twitter: "🎶Grab your goggles, put your lab coat on, here he comes, Professor Proton!🎶 Don't miss an all-new #BigBangTheory tomorrow night at 8/7c! https://t.co/rwkQ31VLaU" / Twitter](https://pbs.twimg.com/media/DU4_Cf8U8AA1EJk.jpg)
The Big Bang Theory on Twitter: "🎶Grab your goggles, put your lab coat on, here he comes, Professor Proton!🎶 Don't miss an all-new #BigBangTheory tomorrow night at 8/7c! https://t.co/rwkQ31VLaU" / Twitter
![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/20/750x445/1206510.jpg)
Big Bang Theory: What happened to Professor Proton? Why did he leave? | TV & Radio | Showbiz & TV | Express.co.uk
![The Big Bang Theory on Twitter: "Sheldon's Professor Proton audition is just what you need to get you through to the weekend. Stream #BigBangTheory: https://t.co/GVDeImxcn3 https://t.co/wWS2zSkxad" / Twitter The Big Bang Theory on Twitter: "Sheldon's Professor Proton audition is just what you need to get you through to the weekend. Stream #BigBangTheory: https://t.co/GVDeImxcn3 https://t.co/wWS2zSkxad" / Twitter](https://pbs.twimg.com/media/DNrhRqMWkAADgdf.jpg:large)