Lieutenant Reed discovers a rogue planet, which has broken out of orbit and therefore is devoid of any light. Life is still possible in some places because heat is bubbling up from under the surface, but T'Pol doesn't detect any humanoid life. Further scans however give a strange energy reading which seems to be coming from a ship on the surface. After the crew has landed, they encounter the Eska. The Eska come from another planet and they say they are hunting for the drayjin, an animal considered a delicacy. When captain Jonathan Archer tries to sleep on the planet, he hears a voice calling him by his name. A human female is wandering in the forest. Somehow he seems to know her.

While Enterprise is visiting Earth, Phlox is abducted by the Klingons and forced to research a cure for a virus destined to wipe out the race. Reed is tapped by a secret agency and ordered to betray Archer. Trip transfers to the Columbia.

While Enterprise tries to bring Trip on board to reverse the malicious Klingon modifications, Phlox and Antaak find a cure for the virus that will not please General K'Vagh.

While attending a conference on a proposed interplanetary alliance, Trip and T'Pol find out from a dying woman that they have a baby. Investigation shows the woman was a member of the xenophobic organization Terra Prime.

Paxton threatens to destroy Starfleet Headquarters if all aliens don't leave Earth. Enterprise must shut down the verteron array on Mars, but it is extremely well defended.