Episode 6Series Episode Number: 191
World Premiere: Sat 27 Jan 1968 - 5:26pm GMT [BBC One] (United Kingdom)
Running Time: 21 minutes 41 seconds
8.30 Million (UK)Appreciation Index: 52 (UK)
Chart Position: 55 () (UK)
Recorded on Sat 06 Jan 1968 in Lime Grove D
Archive State: Found (11-Oct-13)
Astrid discovers the underground bunker and Salamander's secret. On the surface, Giles Kent reveals his true colours.