As the Achaia close in, the crew moves quickly to create a new weapon and save Earth. The time has come for the heroic to make the ultimate sacrifice.

Eager to go home by any means necessary, Niko and Richard head to a planet with an artifact. Erik and Cas go undercover, and William brokers a deal.

When the Salvare finally reaches its destination, Niko and her crew are staggered by what awaits them on the surface.

In a flash, Niko and Richard's world takes a terrifying turn as they wake up in a cold, cruel trap. On Earth, the team grapples with memory gaps.

The new planet holds promise — and unexpected threats in the brush. The tables turn as Richard reaches out to Iara. The Achaia open up to Erik.

Under suspicion for severing a lifeline, Iara now finds her life on the line. William discovers a surprise within. A habitable planet calls to Cas.

After saying goodbye to her family on Earth, Niko wakes in space to find the Salvare off course and divided loyalties among her young crew.

A ship malfunction leaves Niko trapped in a state of deep sleep, where she dreams again and again about the worst day of her life.

As tempers fray aboard the ship, the crew suits up for an expedition to an uncharted planet. On Earth, Erik tries to decode a clue from the artifact.

On an expedition to a mysterious moon, Sasha attempts to make first contact with a second artifact as Niko and Cas get brutally honest with each other.

Shock waves hit a Salvare struggling in the aftermath of an epic act of destruction. Niko questions William's judgement as Erik looks to the Achaia.

While Niko races against the clock to save her ship and crew, she remembers the first time she met Cas. Sasha fears his mental state is deteriorating.