Players adopt the persona of 25-year-old Colonel Scott O'Connor, a military agent who has transferred his brain into raw binary code using experimental technology in order to combat a rogue program in the main defense computer.

The virus in the virtual world takes on properties of an actual virus-it leaves behind debris, mutant creatures, and parasite environments of a biological nature.

At the final level, it is revealed that the virus is of alien origin, having been picked up by the lost Hyperion probe launched to a neighboring planet.

O'Connor stops it before the virus can order the Hyperion to fire its laser weapons and destroy the human population.

In this version, a fifteen-year-boy named Bobby Yano transforms into his samurai ancestor, Jigoku Gokurakumaru, and enters a supercomputer on a space station to clear it of viruses.