As 12-year-old Billy Callahan excavates the Negev Desert with his father, an earthquake sends Billy sprawling into a crevasse where he touches a metallic orb, left here by the original inhabitants of Earth millions of years ago. The orb vanishes during his rescue, concealing the evidence that could verify his incredible story. The orb sends Billy into a 50-year coma. He witnesses the first Earthlings destroy the environment and fight devastating wars before leaving Earth in shambles. The aliens release Billy and ask him to convince the modern-day world to avoid repeating their mistakes or life on earth will perish.