Quantum Leap S02E10 - Catch a Falling Star - May 21, 1979

Sam leaps into Ray Hutton, the understudy for the role of Cervantes just seconds before curtain time. His mission: prevent the drunken star from falling and seriously injuring himself during a benefit performance of "Man of La Mancha." Sam isn't helped by the presence of his former piano teacher, on whom he once had a crush, and who now appears to have caught the star's eye as well.