Third Planet from Altair — Edward Packard

You are flying through space -- past Mars, Jupiter and Saturn -- toward the third planet from the star Altair. You descend to a strange world of deserted cities, glowing caves and man-eating plants. You are here to find the source of the mysterious signals being transmitted to earth.

Depending on how you decide to go about your search, you could be captured by alien beings, flung millions of years into the future through a time warp, or you could witness the creation of the universe.