Shepherd is in a jumper on his own en route to a previously visited planet when a huge ship captures him with his jumper. It is revealed quickly that his kidnappers know he has the Ancient gene and want him to make an old starship of the Ancients fly again. The kidnappers are a star-faring race that do no longer have a home planet (their race became Travelers to avoid Wraith attacks on their home planet). Thus, they are in desperate need of new ships to accommodate all their population.
Shepherd is reluctant to help them but is forced to do so, when - after he sent a distress call - a ship of Wraith appears and attacks the Ancient ship.
I really enjoyed this episode, with lots of Shepherd action. :D