Star Trek: Voyager - Threshold Season 2 Episode 15
Stardate: 49373.4 Voyager’s crew work on designing a small vessel capable of going Warp 10, or being everywhere in space at the same instant. Paris takes the vessel out for a test flight, and everything appears to have gone okay, until Paris later collapses in the mess hall. The Doctor finds Paris’ body is mutating, but he can’t find any way to stop it.