The first series was produced by Don Leaver, while the second was produced by Sidney Hayers. The executive producer was James Gatward. The stories were adapted for television by a number of writers and directors and starred many notable actors in guest appearances including Patrick Troughton, Cyril Luckham, Brenda Cowling, Geoffrey Bayldon, Brian Glover, Ronald Fraser and an early appearance by Rupert Graves.
