In the research facility on the planet Phablos, a virus is created in a botched experiment which turns those infected into monsters. An emergency distress call is sent from the lab. A spacecraft crewed by Commander Steve Krieger and robot sidekick Tinpan respond to the emergency call from the planet, but their craft is attacked and damaged on the way to Phablos.

Upon their arrival at Phablos, those in charge of the laboratory explain that they have managed to contain the virus. Krieger accepts the lab's claims and begins repairs on his ship. The scientist had not been entirely honest with Krieger, and had been attempting to study the virus rather than contain it.

Unfortunately, the virus escapes and infects a lab worker, leaving the lab to face a killer virus that turns them into alien monsters.

Krieger and Tinpan attempt to stop the monster, but their weapons prove ineffective. One of the lab workers develops a bioweapon that proves effective in stopping the monster.