The crew of the Stardust III plans to enter the portal and explore the source of the mysterious radio beacon in the M33 galaxy.

On their way there, they discover ships full of refugees fleeing one disaster, only to be heading into another.

Then, they are almost ready to enter the portal, when survivors, displaced from Earth, are discovered in a place where it is impossible for them to be.

Finally, fully equipped, well-armed, and with a small fleet of ships, they enter M33…Only to discover that not all answers are what you want to hear, and that one race is attacking the damaged ships…