I’d say the TARDIS shares something in common with a shopping trolley – it just doesn’t seem to head where you want it to! In this story, the Doctor (Jon Pertwee) and Sarah Jane (Elisabeth Sladen) were hoping for some relaxation under the sun, but instead they end up on a planet where all technology fails. Despite that, people still visit because the planet provides "Parrinium," a mineral with unusual healing qualiti…