The crew struggles to establish a sense of order on the ship. Two investigations uncover more questions than answers.

All hope seems lost when the crew learns an asteroid is hours away from impact.

When their psyches are put to the test by hallucinations, the crew must race to find the cause.

Sacrifices must be made when a radiation leak sparks crisis.

The crew must devise a plan after identifying a planet rich in much-needed fuel.

The crew discover they're not alone in space and learn more about where they came from.

A new polarizing figure enters the equation as the crew suffers technical difficulties.

After an unpopular decision, discord gives way to deadly mutiny in which loyalties are tested.

The situation onboard Ark One seems hopeless after crew members are taken hostage.

The crew must understand their enemy better as they attempt a dangerous rescue mission.

Ark One tries to broker peace with its adversary but doesn't realize it could cost everything.