While visiting your aunt and uncle at their ranch in Northern California, you decide to go hiking on a nearby mountain. You're prepared for the dangerous trail, but not for the sight that awaits you at the top: an immense dome rising out of the grass, glowing with a mysterious rose-tinted green light. It looks like it's from outer space, but you can't be sure. There's only one way to find out. Your impulse is to investigate, but perhaps you should go for help. What will you do?