In 1968, Nicholas joined the British cast of the musical +Hair, which was brought to London in 1968 by Robert Stigwood in the lead role of Claude. The two years he spent in the part marked Nicholas's first time crossing paths professionally with the producer, and he was later cast in Stigwood's productions of +Jesus Christ, Superstar and +Grease. Nicholas also appeared in the rock-related movies #Tommy, #Lisztomania, and #Stardust. Nicholas's extensive credits in Stigwood's productions and his resulting popularity inevitably led to his recording several singles for the producer's RSO Records, mostly in a disco-pop vein, but his success was largely confined to the stage, where he continued to earn leading roles in major productions, including +Barnum, +the Pirates of Penzance, +Jesus Christ, Superstar's 20th anniversary concert tour, and the 1995 production of +Singin' in the Rain. He also began working behind the scenes in theater during the 1990s, producing the 1993 West End revival of +Grease on behalf of the Stigwood organization. ~ Bruce Eder, Rovi