From the inlay:
NO-ONE IS IMMUNE
Time is running out for corporate mogul Tiron Korsby. A microscopic probe has been injected into his bloodstream by rival corporation Axiom. A probe that with every beat of his heart is homing in on his brain to execute its diabolical plan: total mind control.
Your mission: track down and destroy the intruder.
Microcosm saw the player piloting a miniaturised craft through the interior of a human body, hunting down and destroying enemy robots which have been implanted by a rival corporation. The game is basically an on-rails shooter, but the backgrounds were impressive for the time, having been pre-rendered on Silicon Graphics workstations.