The Big Bang Theory - Season 4, Episode 7: The Apology Insufficiency

Howard (Simon Helberg) gets in a Dept of Defense project and an FBI agent is assigned to interview everyone for the secuirty clearance. Raj (Kunal Nayyar ) and Leonard's (Johnny Galecki) interviews were a disaster but it was Sheldon's interview that sealed Howard's faith. Eliza Dushku guests stars as Special Agent Page and Neil Tyson as himself.

Channel: CBS
Air Date: 4 November 2010