Secrets are finding their way from HMS Zebra, a naval base, to the enemy, rendering the Navy's missile-tracking equipment useless. Steed and Mrs. Gale investigate, and find their attention drawn to the local sweet shop.

All of the information on this episode so far has been user-submitted. This episode has not been released on video in North America yet, so I have not been able to view it.

When Nash enters the laboratory to say "Good Morning" to Thorn, the cameraman bumps into something and the image shudders.

There is an off-camera sound when Cathy and Franks are chatting in a newspaper office... something like a table or chair being dragged along the floor.

Later in the story, when Franks is alone, a squeak is heard as he puts down the phone.

A door is heard opening and closing when Steed and Cathy are supposed to be alone in a pub.

  - Courtesy of Wayne Beckett / Stay Tuned.

Franks: (to counter girl) "Something wrong, Cathy?" (The character's name was Linda and the actress was named Katy)