This is from Star Trek Voyager Season 1 Episode 4 Phage
Searching to replenish their dilithium supplies, Voyager encounters the Viidans who assault other races for their organs. Neelix is attacked and his lungs taken. Now it’s a race against time to retrieve the stolen lungs and save his life.
This is from Star Trek Voyager Season 1 Episode 5 The Cloud
The Voyager becomes trapped in a strange nebula when the crew searches for a new power source for the ship.