On August 22, 1966. Sam Levene replaced Alan King in the starring role of Dr. Jack Kingsley, a psychiatrist, in the Broadway production of "The Impossible Years", performing the role for 322 performances until the show closed May 27, 1967 at the Playhouse Theatre. After the Broadway production closed, Sam Levene starred in the first U.S. national company production of "The Impossible Years" and performed the hit comedy for the duration of 1967 until March 10, 1968 when the production starring Sam Levene closed at the Morris A. Mechanic Theatre in Baltimore, Maryland. National tour stops included performances at New York's Mineola Theatre; Paper Mill Playhouse in Milburn, New Jersey; The Playhouse Theater in Wilmington, Delaware; Royal Alexandria Theatre in Toronto, Canada; Detroit, Michigan; Shubert Theatre, Cincinnati, Ohio; The National Theatre in Washington, D.C.