The First Doctor and chums go for a whistle-stop tour of the wonderful world of Marinus.

Which is a great holiday venue, providing you avoid its cities, mountains, seas and jungles. And the intrepid traveller should also beware of flappy-footed gimps, trouserless tour guides, randy trappers and the Knights Who Say "Ni".

The Doctor and Romana go on their hols for a water and bouillabaisse blowout by the banks of the Seine. 

Naturally, things do not run smoothly as an ancient alien, a mad scientist and a pugilistic private dick muddy the waters and they're surrounded by fake, if enigmatic, smiles.