The senior Outward Bound instructor, Alex, has long since been missing in the depths of the cavernous subterranean pot named 'Wilmer Deep' after going to retrieve a torch which Terry had dropped earlier.

Returning to the outward bound centre, Terry is subjected to much ribbing by his fellow students, including the ring leader Jacko.

Another instructor at the centre, Gordon, becomes aware of Terry's concerns and tells him that he believes his story that Alex had gone missing for two hours, but that he can't say much more than that.

Gordon also informs Terry that the person who has been kidnapped is Dr. Jensen, the only man who knows important strategic communication codes for a military space satellite to be launched shortly.

On the run, Terry stumbles into a nearby farm ruin, which is housing both Dr Jensen and a rather confused Alex, who doesn't seem to remember him.

This was included as a special feature on the Network 2-disc DVD release in 2009, being presented unrestored from the original 625 line PAL videotape.

All thirteen episodes of The Jensen Code were released on DVD as 16mm black-and-white film telerecordings, made for overseas sales to countries not yet broadcasting in colour, and is the only format in which the series exists.