Star Trek: Enterprise: Season 2, Episode 21

2 - 21: The Breach

The rescue of a damaged transport prompts the Denobulan Phlox to confront his prejudices when he treats an Antaran, whose people are sworn enemies of Phlox's. Three other Denobulans are holed up in an underground cave, where Trip, Reed, and Mayweather are dispatched to retrieve them when militants take over a planet.