Willo the Wisp beech wood in Oxfordshire, near the director's home. Kenneth Williams provided voices for all of the characters. The principal narrator, Willo the Wisp, was a blue, floating creature drawn as a caricature of him, while the name refers to the ghostly light will-o'-the-wisp from folklore. The other main characters were Arthur the caterpillar (as a gruff cockney), Mavis Cruet, a plump, clumsy fairy with an erratic, magic wand, and the principal antagonist, Evil Edna, a witch in the form of a walking, talking television set who could zap people with her aerials. Other characters included Carwash, a snooty bespectacled cat
Willo the Wisp (based on Noël Coward), with the catchphrase, "My eyes are not first-class, you know", The Moog, a supposed "dog" who is unable to think for himself, Twit, a small bird, The Beast, a former prince turned into a hairy shambling creature by Evil Edna, gnomes, the Astrognats (a group of bugs who explore outer space by means of their toadstool rocket), the Bookworm and a regiment of toy soldiers. Each of the original 26 episodes lasted approximately 5 minutes and were broadcast at 5:35pm on BBC1, continuing a tradition of short cartoons (such as "The Magic Roundabout" and "The Wombles")