Summary At Holy Loch in Scotland a team of Nazi frogmen infiltrate a nuclear submarine, overpowering its crew. The demand is simple; unless five million pounds is paid as a ransom nuclear devices pointed at London will go off, destroying the city. To activate the devices a nuclear physicist is required and, when Dr. Mueller goes missing, it seems likely that he has been kidnapped for that purpose. The Champions manage to locate him and, posing as his associates, board the submarine with him. Alas, he too is a Nazi sympathiser and part of the plan, who gives the Champions away. The ransom is paid but the weapons are still focussed on the capital and, with only minutes to spare, the team from Nemesis must prevent the worst from happening.

• Adventure
• Sci-Fi
• Thriller