Jeremy Renner; Jack Hanna From "Hansel & Gretel: Witch Hunters", actor Jeremy Renner; animal expert Jack Hanna. Details Casts Title Jeremy Renner; Jack Hanna Genres Talk Comedy Release Date 2013-01-17 Episode Runtime 01 Hours 03 Minutes Season Number 20 Episode Number 12 Production Companies Worldwide Pants, CBS Entertainment Productions, CBS Productions, CBS Studios David Letterman Self - Host Paul Shaffer Self -Musical Director Alan Kalter Self - Announcer (voice)