West End and given the part of Virgil Tracy. Following the completion of the first series, Holliday returned to the US. The character was voiced by English actor Jeremy Wilkin for Thunderbirds Are Go, Series Two and Thunderbird 6. British actor David Graham was among the first to be cast. He had previously voiced characters in Four Feather Falls, Supercar, Fireball XL5 and Stingray. Beyond the APF productions, he had supplied one of the original Dalek voices on Doctor Who. Cast alongside Graham was Australian actor Ray Barrett. Like Graham, he had worked for the Andersons before, having voiced Titan and Commander Shore in Stingray. A veteran of radio drama, Barrett was skilled at performing a range of voices and accents in quick succession. Villains of the week would typically be voiced by either Barrett or Graham. Aware of the sensitive political climate of the Cold War and not wishing to "perpetuate the idea that Russia was the enemy with a whole generation of children watching", Gerry Anderson decided the Hood (voiced by Barrett) should be Oriental and placed his temple hideout in Malaysia to defy the viewer's expectations. Although Lady Penelope and Parker (the latter voiced by Graham) were among the first characters developed, neither was conceived as a major role. Parker's Cockney manner was based on a waiter at a pub in Cookham that was sometimes visited by the crew. On Gerry Anderson's recommendation, Graham dined there regularly to study the accent. Anderson's first choice for the role of Penelope had been Fenella Fielding, but Sylvia insisted she take the part herself. Her Penelope voice was intended to emulate Fielding and Joan Greenwood. On Penelope and Parker's secondary role as comic relief, Gerry explained, "We British can laugh at ourselves, so therefore we had Penelope and Parker as this comedy team. And in America they love the British aristocracy too.'" As well as Jeff Tracy, English-Canadian actor Peter Dyneley voiced the recurring character of Commander Norman, chief of air traffic control at London International Airport. His supporting character voices were typically those of upper-class Englishmen. Shane Rimmer, the voice of Scott, was cast on the strength of his performance on the BBC soap opera Compact. Meanwhile, fellow Canadian Matt Zimmerman was selected at a late stage in the process. The expatriate West End actor was given the role of Alan on the recommendation of his friend, Holliday: "They