His Highness the Rangdo of Arg has arranged a particularly tricky set of problems for this week's explorers. How many Argonds are lurking round the pond, and how are the explorers expected to get through the Crystal Mine when the anti-gravity boots are chained up?
Tackling these and other puzzles this week are Ruth Madoc, Professor Heinz Wolff and Deborah Leigh Hall

The final broadcast direct from the Planet Arg. Another team of Earth explorers have problems to solve. Will any of them win a cheese roll and survive long enough to cross the Vortex?
This week's explorers are: Heather Couper, Keith Chegwin, & Adam Gilbey