A Delta Quadrant people whose world was devastated by antimatter technology learned from the Earth probe Friendship One, leaving the survivors sick, embittered and living in a nuclear winter.
The Uxali are a humanoid species who appear in the Voyager episode Friendship One. In the 21st century the probe Friendship One, launched from Earth with greetings and technical knowledge, reached their planet. They used its designs to build an antimatter power grid, which failed and blanketed the world in radiation.
Generations later the survivors live underground, scarred and dying young. When Voyager is sent to recover the probe in 2378, an away team is seized by the Uxali leader Verin, who blames humanity and demands that his people be moved to another world. He kills Lieutenant Joe Carey to show that he is serious.
A scientist named Otrin, and a mother whose baby the Doctor saves, prove more open. Using nanoprobes and atmospheric torpedoes, the crew neutralise the radiation and clear the skies.