The crew examine a mysterious computer error that is having dangerous consequences all over the ship.

KL 5 flies past the Asteroid belt. When the alarm sounds, Kingston fears the worst nevertheless he consents to accompany Anna to a remote point of KL 5 where they can observe the approaching belt.

Michael and Kumiko have fallen in love with each other and Kingston decides to give them a hard time. Professor Ingessol meanwhile has installed an SOS radio in the control room, in order to send signals to Eath. Unfortunately the signals activat a global defense satellite system, and the station is attacked.