Cartoon favourites Yogi Bear and Muttley from Wacky Races are about to star in a £20m campaign for Müller. Wünderful Stuff, which also features Mr Men characters, kicks off on 8 October with a 90-second ad shown during ITV1’s The X Factor and simultaneously on 50 other TV channels. The ad shows the characters transform a dull city into a world of “bright colours, rainbows and unicorns”. Müller marketing director Lee Rolston said the company wanted consumers to make yoghurt more of a priority. “We take plain stuff yoghurt and stir in something wonderful,” he said.