In 2020, a computer capable of simulating combat from any point in history exists. A "Predator Virus" infects the system and creates a time-distortion vortex, which threatens to affect the world. The player controls Stanley Opar, who enters the vortex to try and stop the virus. Stanley must combat various enemies throughout different time periods: Prehistoric, Roman Empire, Feudal Japan, Medieval, Conquistador, Wild West, Modern Wars, and Future (Stanley's era).