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Kumiko is unhappy to learn that her holiday is canceled and she must travel to a mining colony on Io with her parents where she doesn't fit in.

Violent earthquakes are destroying and destabilising the mines and Kumiko, Michael and Gerard must make a dangerous jorney to escape.

While the adults estimate the damage to the colony and repair the remaining life support systems, the children help with the salvage work.

While the inhabitants of the colony prepare for the evacuation, Anna and Kingston creep into locked areas of the colony, in order to save their belongings.

The crew struggle to get the life support system back online. Whilst conflicts between Michael and Gerard cause the system to be damaged further.

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

The adults prepare the ship for a complicated flight maneuver at Saturn, in order to rendezvous with a supply ship containing vital fuel. The children become restless, exacerbated by the increased food rationing.

When Duffy arranges a health check, Kumiko sees this as an opportunity to let Michael and Gerard settle their rivalry once and for all in a match.

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.

Kingston and Anna are excited by the rapidly approaching Christmas Holiday. The adults however are busy with fuel reserves and making preparations for a rendezvous with an unmanned courier ship.

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.

After an explosion the adults try to stabilize the station again, only to discover that they are now dangerously low on fuel.

The space station is heading off course towards the sun. The adults try to save the children by placing them in the tug and using it as a life boat.