Zienia Merton — Sandra Benes Anton Phillips — Doctor Bob Mathias Nick Tate — Captain Alan Carter Uncredited Artists Suzanne Roquette — Tanya Tony Allyn — Security Guard One (Irwin) Quentin Pierre — Security Guard Two (N'Dole) Sarah Bullen — Kate Music In addition to the regular Barry Gray score (drawn from "Breakaway" and "Another Time, Another Place"), excerpts from Paul Bonneau and Serge Lancen's composition Suite Appassionata—Andante are featured throughout the episode and Jack Arel and Pierre Dutour's 'Picture of Autumn' is used during Ferro and Anna's encounter with the Arkadian intelligence. Production Notes Script editor Johnny Byrne and director David Tomblin worked closely together to craft this final episode—mostly, Byrne recalls, as there was little money left in the series' budget. The idea of the 'ancient astronaut' was popularised by Swiss author Erich von Däniken in his book Chariots of the Gods? published in 1968. Melding this premise with the spirituality of the Adam and Eve story of Creation excited Tomblin, but Byrne felt it was a little too 'on the nose' with the imposed religious context. Though enjoying the story, he felt it was let down by the time limitations of the one-hour episode format and the necessary under-budgeting. Fan response was positive, as the episode is seen to bring the (unintended) story arc of the Moon's predestined journey through space to a conclusion. Orso Maria Guerrini was the last of four Italian artists employed by the series as per an agreement with RAI, the Italian production company and series financial partner. Guerrini's English proved difficult to understand and his dialogue was dubbed by renowned voice artist Robert Rietty. Tony Allyn and Quentin Pierre had played unnamed Security guards throughout the series. The script for this episode listed their surnames as 'Irwin' and 'N'Dole', though these were never spoken aloud. Koenig's voice-over narration throughout the story was a last-minute addition, used to clarify several abstract plot points. Producer Sylvia Anderson felt that 'we were really just getting into our stride in this episode—episode twenty-four. It was probably a little slower than some of the other episodes, but quite profound. I think Johnny Byrne was taking a very interesting concept, and more to the point...we learned about the characters.' However, her personal and professional partnership with husband Gerry Anderson came to an end soon after the conclusion of filming. Before the wrap party, he made known his intentions