![TIL Steven Yeun, Glenn from "The Walking Dead," also played Sheldon's previous roommate Sebastian in "The Big Bang Theory." : r/geek TIL Steven Yeun, Glenn from "The Walking Dead," also played Sheldon's previous roommate Sebastian in "The Big Bang Theory." : r/geek](https://external-preview.redd.it/n6AICaN0ncS26fvdm6_nxCccFDfFgnoW1AKLMyGBhd0.jpg?auto=webp&s=dbbe8ea9d061aafc7e6d9f36779ef436205ea963)
TIL Steven Yeun, Glenn from "The Walking Dead," also played Sheldon's previous roommate Sebastian in "The Big Bang Theory." : r/geek
![Amazon.com: Season 5 : Johnny Galecki, Jim Parsons, Kaley Cuoco, Simon Helberg, Kunal Nayyar, Mayim Bialik, Melissa Rauch, Kevin Sussman, Chuck Lorre, Bill Prady, Mark Cendrowski, Anthony Rich, Peter Chakos, Nikki Lorre, Amazon.com: Season 5 : Johnny Galecki, Jim Parsons, Kaley Cuoco, Simon Helberg, Kunal Nayyar, Mayim Bialik, Melissa Rauch, Kevin Sussman, Chuck Lorre, Bill Prady, Mark Cendrowski, Anthony Rich, Peter Chakos, Nikki Lorre,](https://m.media-amazon.com/images/I/81ufuUqgmCL._RI_SX720_FMjpg_.jpg)
Amazon.com: Season 5 : Johnny Galecki, Jim Parsons, Kaley Cuoco, Simon Helberg, Kunal Nayyar, Mayim Bialik, Melissa Rauch, Kevin Sussman, Chuck Lorre, Bill Prady, Mark Cendrowski, Anthony Rich, Peter Chakos, Nikki Lorre,
![So Steven Yun was in The Big Bang Theory for a few seconds at the same time he was Glenn in The Walking Dead. A TWD episode actually gets mentioned in a So Steven Yun was in The Big Bang Theory for a few seconds at the same time he was Glenn in The Walking Dead. A TWD episode actually gets mentioned in a](https://i.redd.it/kes0gws8a2n61.jpg)
So Steven Yun was in The Big Bang Theory for a few seconds at the same time he was Glenn in The Walking Dead. A TWD episode actually gets mentioned in a
![Big Bang Theory: Who are the biggest guest stars to ever appear in the series? | TV & Radio | Showbiz & TV | Express.co.uk Big Bang Theory: Who are the biggest guest stars to ever appear in the series? | TV & Radio | Showbiz & TV | Express.co.uk](https://cdn.images.express.co.uk/img/dynamic/20/590x/Big-Bang-Theory-5-best-cameo-appearances-1182152.jpg?r=1570802438297)