The Late Show with Stephen Colbert Season 4 Episode 149 The Cast of The Big Bang Theory, Barenaked Ladies ( Air Date 2019-05-16 ) Genre Comedy, Talk category. Overview "Stephen welcomes actors Johnny Galecki, Jim Parsons, Kaley Cuoco, Simon Helberg, Kunal Nayyar, Mayim Bialik, Melissa Rauch (from “The Big Bang Theory”), with a musical performance by Barenaked Ladies.".