In Oklahoma!, Mr. Platt danced the part of "Dream Curly" in the musical's groundbreaking dream sequence, which was choreographed by Agnes De Mille. He also appeared in the film of the show. Prior to that, he performed in the musicals The Lady Comes Across and Beat the Band, both in 1942. In 1953 he returned to Broadway in Maggie. Mr. Platt's most significant film appearance was arguably as one of the vigorous, manly, dancing brothers in the 1954 film musical "Seven Brides for Seven Brothers." His siblings in that film included the likes of Howard Keel, Russ Tamblyn and Jacques d'Amboise. He also danced in "Tonight and Every Night" (1945), a Rita Hayworth vehicle set in England; "Tars and Spars" (1946); and "Down to Earth" (1947).

He was born Marcel Emile Gaston Leplat Dec. 2, 1913, in Pasadena, and later moved with his family to Seattle. He began to dance when he was 11. In the 1930s, he joined the Ballet Russe de Monte Carlo and toured with them for six years. In the 1960s, he was producer and director of Radio City Music Hall’s ballet troupe for eight years.

Survivors include a son, Ted Leplat, from his first marriage, to Eleanor Marra; and two children, Donna and Michael Platt, from his second marriage, to Jean Goodall, who died in 1994.