Severe rationing can't save the Destiny's dwindling water supply, forcing Colonel Young and Lieutenant Scott to seek out drinkable water on a deadly ice planet.

Aboard Destiny, Dr. Rush supervises the exploration of new areas of the ship. Looking for resources to make their everyday lives easier, the crew stumbles upon a piece of Ancient technology that carries the promise of a way home. While somewhat familiar with the find, Dr. Rush can’t guarantee the safety of using it, bringing him and Col. Young to a standoff on what to do.

Lt. Tamara Johansen tries to track down what is causing the crew to hallucinate.

Earth's Stargate Program isn't the only group in the Milky Way that's interested in the Ancients' Destiny. What's worse, this long-time foe may have a spy among those closest to the Icarus project.

Chloe behaves in a bizarre way, prompting a search of her quarters, where Lt. Scott finds a journal penned in an alien language. Elsewhere, Eli copes with his mother's medical condition.

Rush and Young investigate an abandoned alien craft which is just outside the Destiny. While they do this, the crew onboard the ship find the bridge and discover that Rush is responsible for the countdown clock not activating when the ship emerges from FTL.

Chloe's body is taken over by another consciousness. Meanwhile, Dr. Volker is stricken with a mysterious illness.

While attempting to return a group of colonists to their home, the crew finds that the planet is on the verge of seismic destruction.