AllMovie

The titular, glowing greenstone is located somewhere in an enchanted, forbidden forest. Living on the edge of the woods, a young boy (Joseph Corey) dedicates himself to finding the magical rock. In so doing, the lad stumbles onto a wondrous, Tolkien-esque "alternate world." The special effects aren't all that special, but the film's energy and sincerity go a long way. In addition, the performances are engagingly larger-than-life, permitting adults to revel in the "kidding on the square" ambience of the proceedings. Originally produced for PBS, the 48-minute Greenstone has since been released on video.