When Rachel and Kirsty find Ruby the Red Fairy in the pot at the end of the rainbow, they must discover where the other Rainbow sisters are before it's too late.
When a little crab leads Rachel and Kirsty to a tide pool where Sky, the blue fairy, is trapped in a bubble, Jack Frost's evil goblins attempt to thwart the rescue mission.
When the evil Jack Frost sends the Rainbow Fairies away, Rachel and Kirsty hope that a merry-go-round that transports them to a magical world will lead them to Heather.