The man behind Who's on First helped sell 85 million dollars in war bonds in 35 days, yet refused to speak to his comedy partner off-camera for months. Hours after an unimaginable family tragedy, he stepped to the microphone and made millions laugh. This is the staggering paradox of Lou Costello.

This episode unpacks the deeply human biography behind the legend, exploring how one of the 20th century's greatest physical comedians built his career on a foundation you would never expect, and how effortless on-screen chemistry masked fracturing relationships and profound private pain.

• How the clumsy sidekick was actually a star athlete, two-time hometown free-throw champion, prize-fighting boxer, and Hollywood stuntman
• The butterfly-effect moment when, stranded broke in Missouri, he became a burlesque Dutch comic and crossed  ...