||This range of two-part audio dramas stars Tom Baker reprising his most popular role as the Fourth Doctor (from 1974 - 1981) with a number of his original TV companions. This fifth series reunites the Doctor with Romana (Lalla Ward), a fellow Time Lord for adventures across Time and Space! A modulated frequency wave cancellation signal isn't something that the Doctor and Romana expect to detect in 1960s London. But then they don't expect to find Professor Lanchester, the man who invented it, lying unconscious. Or MI5 investigating. With the help of MI5 Agent Miller, Lanchester's daughter Jill, and his nephew a pirate radio DJ called Mark, the Doctor, Romana and K-9 investigate. They soon discover that there is more at risk than they imagined, and an alien invasion is about to begin. Can the Doctor identify and defeat the aliens in time? Will Romana manage to find a recombinant transducer before it's too late? And how will K-9 cope with his new job? The fifth series in a Big Finish range which is hugely popular with fans of the classic TV series Doctor Who.The pairing of the Doctor and Romana harks back to the most-watched period of Doctor Who, one that to a generation is the most loved and iconic and which broke the records for viewers of the show. Guest actor Karl Theobald is a familiar voice and face from such TV hits as Green Wing, Primeval and Twenty Twelve. CAST: Tom Baker (The Doctor), Lalla Ward (Romana), John Leeson (K9), Karl Theobald (Mark Lanchaster), Phil Mulryne (Barnaby Miller), Alix Wilton Regan (Jill), John Banks (Derek Fretus).