As Archer tries to unravel the mystery of a rescued alien, long-simmering feelings explode among his senior officers.

Steven Culp (Major Hayes)
Noa Tishby (Corporal Amanda Cole)
Thomas Kopache (The Alien)

• The alien is a test subject from a trans-dimensional realm, apparently one of the species who built the spheres.
  
• Tucker begins neuropressure sessions with Corporal Cole and the two have become "friendly". T'Pol seems jealous. T'Pol reveals Sim told her about his feelings, and Trip gets jealous. T'Pol and Trip end up kissing and then… an "exploration of human sexuality."
  
• The friction between Reed and Hayes culminates with them beating the crap out of each other, but they end up settling their differences.
  
• Before he dies, the Alien tells Archer "When the Xindi destroy Earth, my people will prevail."
  
• Thomas Kopache (The Alien) has played several different aliens in Next Generation, Deep Space Nine, and Voyager. He also played a Vulcan diplomat in the Enterprise pilot, "Broken Bow".