Lurking death in the tunnels - this must be a Terry Nation script. Quite a suspenseful one too, with archaeologists being zapped to death in a cave system under a church, and mysterious tracks being left behind. Steed and companion of the week Inge (Dora Reisser, who I kept hoping was Caroline John doing an accent) excellently find a crashed van in a quarry; inside is an open crate marked Extreme Danger with two now empty compartments.
So far so good, and we're pretty uneasy about what the threat (both threats) might actually be. But when we do see them, they're just small oblong black boxes, whirring painfully as they lurch across the floor. This is such a let-down that we can't really care much about Iain 'Garron' Cuthbertson's plot to distribute thousands of the boxes and drain the whole country's electricity supply.
Tara has some rubbish comedy scenes with Willoughby Goddard (all the way from The Frighteners), and has to deal with the second box which Steed has, perhaps rather irresponsibly, sent to her house. Some tension does creep into this scene, but I'm still wondering what they were thinking with the box design.
A disappointing episode. The buildup is good, but it writes cheques the reveal can't cash.
Previously and also seen: Edward 'Prof Kettlewell' Burnham returning from The Fear Merchants. Vernon 'Chief Scientist' Dobtcheff in his third
appearance. John 'Doc Morrissey' Horsley as the doctor, returning from Mr Teddy Bear where he also played a doctor.
Previously seen: Jeremy 'sitcoms' Lloyd returning From Venus With Love, Hugh Manning in his third appearance, Russell Waters from Castle DeAth, John Moore from The Hidden Tiger and Harry Shacklock in his third appearance.
