![Johnny Galecki & Glenn Quinn (aka Mark & David from Roseanne) | Famous faces, Glenn quinn, Johnny galecki Johnny Galecki & Glenn Quinn (aka Mark & David from Roseanne) | Famous faces, Glenn quinn, Johnny galecki](https://i.pinimg.com/originals/bb/70/b3/bb70b3147d50bbcc243569a582163e5d.jpg)
Johnny Galecki & Glenn Quinn (aka Mark & David from Roseanne) | Famous faces, Glenn quinn, Johnny galecki
![Big Bang Theory cast: Who did Creagen Dow play in The Big Bang Theory? | TV & Radio | Showbiz & TV | Express.co.uk Big Bang Theory cast: Who did Creagen Dow play in The Big Bang Theory? | TV & Radio | Showbiz & TV | Express.co.uk](https://cdn.images.express.co.uk/img/dynamic/20/590x/secondary/The-Big-Bang-Theory-cast-2545794.jpg?r=1593549461738)
Big Bang Theory cast: Who did Creagen Dow play in The Big Bang Theory? | TV & Radio | Showbiz & TV | Express.co.uk
![The Big Bang Theory finale: Who did Sarah Michelle Gellar play? | TV & Radio | Showbiz & TV | Express.co.uk The Big Bang Theory finale: Who did Sarah Michelle Gellar play? | TV & Radio | Showbiz & TV | Express.co.uk](https://cdn.images.express.co.uk/img/dynamic/20/590x/big-bang-theory-sarah-michelle-gellar-1128396.jpg?r=1558084070225)
The Big Bang Theory finale: Who did Sarah Michelle Gellar play? | TV & Radio | Showbiz & TV | Express.co.uk
![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?width=640&crop=smart&auto=webp&s=324b5c122cc7fac02c9c266dda9cf913a5077280)