Max, aged 4, and Lara, aged 5, are painting pictures when Zed, the little red dragon, comes to visit. Zed invites the children to come and paint with his friends in Dragon Land. The friends are dragons of different colors that can paint with their tails. When they paint a rainbow in the sky, the purple dragon paints Max, too, by mistake! The purple paint will not wash off, so how will the dragons return Max to his normal color?