A third example of the 'fantastic happenings which turn out not to be quite so fantastic' story, revolving around the possible invention of an invisibility formula, and its uses to a certain foreign power.
Unfortunately it's also an example of a komedy spy story, as can be seen from the presence of Warren Mitchell (his fourth appearance) as Brodny again. I find the constant scenes of him cringing before his political bosses very irritating.
It's not a bad story overall I suppose, the invisibility is quite ingeniously explained, though if there was a reason for the mysterious happenings in the park, I missed it.
Also seen: John 'Rev Ernest Matthews' Nettleton.
Previously and also seen: Roy Kinnear making his third appearance, Moira 'Domitia' Redmond coming all the way back from Hot Snow.
