Baby Bop, BJ and the children prepare for the Shapes Carnival. Riff knows he will do well at the carnival because he is wearing his lucky medal. When he loses the medal, Riff is afraid he won't be able to play the games. | When it starts to rain at the park, Baby Bop joins Barney and BJ inside the caboose. Baby Bop spies a beautiful rainbow in the sky! When the others come to see it…it's gone.