Voyager's crew is giving help to the Nezu's planet when they are being hit by asteroids. Tuvok and Neelix are trapped on the ground when they attempt to rescue a Nezu doctor who says he has information about the asteroids that are hitting the planet.

Stardate: 50973 The Doctor's life-extension experimental treatment sends Kes out of temporal sync. She begins traveling backward through time from the moment of her death. With each shift, she comes closer to a solution but she also grows months and years younger at a time.