‘Castle’ season 6, episode 20: A groovy case takes Castle to the ’70s Castle season 6, episode 20 brings the ’70s back as Rick and Kate investigate a murder set in the disco era. April 21, 2014
‘The Big Bang Theory’ 6×20 ‘The Tenure Turbulence’ episode summary, guest stars return CBS has released the summary for episode 6×20 of The Big Bang Theory, entitled “The Tenure Turbulence” – and it looks like more than one familiar face will be returning to join the prestige-fray. Mild spoilers ahead. March 19, 2013