Dougal and the Blue Cat (Pollux et le Chat Bleu) is a film based on The Magic Roundabout. It was released in France in December 1970 and its English version, narrated by Eric Thompson like the original series, was released in 1972.
Synopsis
Life at the Magic Roundabout is disrupted when a blue cat called Buxton finds his way into town. Everyone loves Buxton except for Dougal, who discovers the cat's mad plan to become the king of blue army and destroy all who are not blue.