Gemworld

Sparkling like a three-dimensional snowflake in the depths of space, Gernworld once was one of the Federation's greatest marvels. Six different alien races coexisted peacefully on an artificial world composed entirely of crystal -- until the very substance of Gemworld began to multiply out of control, tearing the world apart. Now the entire planet -- and the Starship Enterprise™ as well-faces total destruction. The only way to stop the disaster is to turn off the vast network of force fields hol