Sal Mineo as Gene Krupa; Susan Kohner as Ethel Maguire; James Darren as Eddie Sirota; Susan Oliver as Dorissa Dinell; Anita O'Day as Herself; Bobby Troup as Tommy Dorsey; Buddy Lester as Himself; Red Nichols as Himself; Yvonne Craig as Gloria Corregio; Lawrence Dobkin as Speaker Willis; Celia Lovsky as Mother; Shelly Manne as Davey Tough; Ruby Lane as Blues Singer; Gavin MacLeod as Ted Krupa; John Bleifer as Father