Arian Foster is not lying: There is indeed no plot whatsoever to any episode of Caillou. The average episode involves Caillou being challenged by something: dogs, loud noises, the wind, stairs, cats, vegetables, sitting up, taking really big breaths. He fails at all of these and cries before being left by the side of the road by his laughing parents. They drive off, ecstatic and free, as the credits roll and the screen fades on a shivering silhouette of Caillou alone in the wilds of rural Quebec.
Thank you.