The Vidiians experiment on B'Elanna, splitting her into two beings... one fully human, the other fully Klingon.
1-09: Prime Factors
Voyager discovers a way home on an alien world, but its inhabitants refuse to share the technology.
Upon discovering an alien graveyard, Kim is whisked across the galaxy to the species’ homeworld, whose inhabitants believe he has returned from the dead.
1-05: The Cloud
In search of energy, Voyager enters a nebula-like cloud, only to discover it’s a life-form.