

Steve Allen’s zany spontaneity turns “Tonight” into an unexpected hit, but it’s Jack Paar and Johnny Carson that transform late night into an enduring television staple.

Johnny Carson deftly navigates the turbulent 1960s to elevate “The Tonight Show” and become the undisputed king of late night.

As the 1980s dawn, David Letterman reinvents late night for a new generation and endless speculation begins on who will be Johnny Carson’s eventual successor.

Carson’s 1992 retirement touches a nation – and touches off an epic late-night war between Jay Leno and David Letterman.