BadJelly the Witch, is an imaginative tale originally written by the legendary Spike Milligan for his own children in 1973. It is a classic fairytale full of weird and wonderful surprises, good triumphing over evil, and the defeat of BadJelly the Witch - 'the baddest witch in the world'. The exciting new style of animated characters directly interact with Spike as he draws and tells their story.

Tim and Rose live with their Mummy and Daddy and Lucy their cow, who provides them with milk for breakfast. When Lucy disappears, the children decide to look for her and so begins their adventure. On their journey they meet all sorts of weird and wonderful creatures including Binklebonk the Goblin, Dinglemouse, Dulboot the Giant and BadJelly the Witch herself who captures the children and imprisons them in her castle.

Like all fairy stories, BadJelly the Witch does eventually have a happy ending and the children and Lucy the cow are returned home safe and sound.