The Big Bang Theory 11×21 Promo “The Comet Polarization”

The Big Bang Theory 11×21 “The Comet Polarization” Season 11 Episode 21 Promo – Sheldon’s comic book store experiences changes when writer Neil Gaiman puts Stuart’s store on the map. Also, Koothrappali takes credit for Penny’s astronomical discovery, and friendships are threatened, on THE BIG BANG THEORY, Thursday, April 19th on CBS.