Actor Bob Hoskins directs this children's fantasy. When Mike (Willy Lavendal) actually finds the end of a rainbow, his friends don't believe it until he shows it to them. After that, they figure out how to find the next time and place for a rainbow-landing, and together they go to it. When they bicycle onto it, they find themselves transported more than a thousand miles away, to Kansas. There, they run afoul of the local Sheriff (Dan Aykroyd) and only make it back to the rainbow and then to their homes in New Jersey in the nick of time. When they tell their parents where they have been, they are quite naturally accused of making it all up. However, strange phenomena begin to occur and color begins to disappear from the world. One of them has taken some golden nuggets from the rainbow, and the nuggets must be returned if the world is to survive.
~ Clarke Fountain, All Movie Guide