Those 14 lovable rocks (and one wise little ladybug) are back on the hill for another adventure as they help their new friend, Tess, learn the importance of believing in yourself, and that everyone matters. When Tess, a tin foil ball, rolls onto the hill and meets Marvin, Ricky and the rest of the rock group, she immediately worries that she's not good enough to play with them. But when one of the pebbles goes missing, it's Tess to the rescue, and she discovers that even a tin ball can be a rock star.