Rubik discovers the beach life on the family vacation to Hawaii. When he has an unfortunate run-in with a really mean crab, Rubik ends up in peril, all mixed up in the water. He is rescued by a Hawaian boy named Kimo and is returned to his grateful friends. Rubik's multicolored faces remind Kimo of a mysterious crystal embedded in a nearby volcano which is supposed to be inhabited by a ghost. The kids are so intrigued and curious to see whether the crystal has anything to do with their cube that they talk Kimo into taking them up to see the crystal and the ghost. That night, on the the way up the volcano, Kimo slips and falls. So it's Rubik and his powers to the rescue, and his secret is out. And when the kids and Rubik make it to the top to see the crystal, they discover, not only a lonely ghost, but also a couple of creeps who intend on stealing the pricelss crystal.
