Who played the handsome doctor in the rock opera "Tommy"?

John Joseph Nicholson (born April 22, 1937) is an American actor and filmmaker who has performed for over sixty years. He is known for playing a wide range of starring or supporting roles, including satirical comedy, romance, and darkly comic portrayals of anti-heroes and villainous characters. In many of his films, he has played the "eternal outsider, the sardonic drifter", someone who rebels against the social structure.

Jack Nicholson played the part of The Specialist, a handsome doctor who specializes in psychosomatic conditions.

"Tommy" is a 1975 British independent rock musical fantasy drama film based upon The Who's 1969 rock opera album "Tommy" about a "seemingly disabled" boy who becomes a pinball champion and religious leader. Directed by Ken Russell, the film featured a star-studded ensemble cast, including the band members themselves (most notably, lead singer Roger Daltrey, who plays the title role), Ann-Margret, Oliver Reed, Eric Clapton, Tina Turner, Elton John, and Jack Nicholson.