Enterprise picks up a distress call from a Vulcan ship, the Seleya, which T'Pol recognizes as a ship she once served on. The ship is located in a somewhat treacherous asteroid field — the asteroids are moving in a chaotic, unpredictable pattern due to the Expanse's spatial anomalies. When Archer and his away team board the Seleya, they are attacked by insane zombie-like Vulcans. Meanwhile, Tucker and Mayweather land on one of the unstable asteroids to mine Trellium ore.

Sean McGowan (Corporal Hawkins)

Ian Eyre (Vulcan Zombie #1)
Alex Syverson (Vulcan Zombie #2)
Steve Blalock (Vulcan Zombie #3)
Tom Morga (Vulcan Zombie)

• The asteroids are rich in Trellium ore. Phlox discovers Trellium is a neuro-toxin to the Vulcan nervous system and causes them to lose control of their emotions. Archer has Tucker store it in a biohazard locker until Phlox can create a cure for T'Pol.
  
• T'Pol previously served on the Seleya, which entered the Expanse nine months ago. The Vaankara was sent on a rescue mission, as seen in "The Expanse".
  
• The Seleya is named for Mount Seleya on planet Vulcan. (Spock was joined with his katra on Mount Seleya in Star Trek III.)