Billy was a childhood friend of Rachel Defwydd (Ray) who had a crush on him. His favourite hobby was driving and maintaining his bike, the Vincent. Billy built a speaker system with spare parts from the war. When the Chimeron Delta arrived at the camp, Billy took a shine to her and sang "Why Do Fools Fall in Love" in dedication to her. She told him of the Bannermen and he helped her look after the Chimeron princess. He took Delta and the child to a secluded spot by a river where they rested. Ray and the Seventh Doctor warned them of the impeding attack by the Bannermen.