The user plays as Jack, a young man who comes to an amusement park to ride a new attraction called "Tunnel of Destiny". Actually, he does not know anything about it - the advertising leaflet contains only one slogan: "Experience unforgettable adventures - plunge into the primeval world". But everything goes wrong! Right in the middle of the dark tunnel his railcar stops for some time and then goes off at a dash, falling down into a deep lake. Shocked and soaked through, Jack sees thatch-roofed huts of a primitive tribe. He has just accomplished a real time travel!