The teams engineer a system of burglar alarms to protect a secret document that is hidden in an office. The guest judge is Brigadier Alan Needham. Meanwhile, Lesley Judd puts another Incredible Egg Machine is put to the test. The electronic-style theme tune to 'The Great Egg Race' was written by Richard Denton and Martin Cook. The duo also provided music for 'Hong Kong Beat', 'Quiller' and 'Tomorrow's World'. The opening title sequence which accompanies the theme tune was created by Aardman; the animation company behind the renowned inventors Wallace and Gromit.

• Johnny Ball
• Brian Cant
• Lesley Judd