Star Trek: Enterprise: Season 3, Episode 5

3 - 5: Impulse

When Enterprise responds to a distress call from the Vulcan cruiser Seleya, stranded in the Delphic Expanse, Archer and his boarding team (T'Pol, Reed, and Hawkins) arrive on board to find its crew in a deranged, raging, zombie-like state that quickly manifests in T'Pol as well.