Archer, T'Pol and T'Pau attempt to bring the Kir'Shara — an artifact believed to contain Surak's original writings — to the Vulcan capital, as Enterprise gets involved in a Vulcan-Andorian military clash.

Robert Foxworth (Administrator V'Las)
Jeffrey Combs (Commander Shran)
John Rubinstein (Minister Kuvak)
Gary Graham (Ambassador Soval)
Michael Reilly Burke (Koss)
Kara Zediker (T'Pau)
Todd Stashwick (Talok)
Jack Donner (Vulcan Priest)

Melodee M. Spevack (Andorian Com Voice)

• Part 3 of 3.
  
• V'Las has convinced the Vulcan High Command that Andoria has Xindi technology and uses this fear to launch an invasion of Andoria.
  
• T'Pau melds with T'Pol and cures her Pa'nar Syndrome (diagnosed in "Stigma"). According to T'Pau, it is caused by inexperienced melders and can be cured by a meld with an experienced melder. The Vulcan High Command created the stigma to discredit the Syrannites among the Vulcan people.
  
• Shran kidnaps Soval and tortures him for fleet intelligence.
  
• V'Las is relieved of his duties for treason. This episode begins the turning point in Vulcan history when Vulcans begin their journey from the devious Vulcans of the Star Trek: Enterprise era to the species seen in the Original Series era and beyond.
  
• Koss releases T'Pol from their marriage.
  
• Surak's katra is transferred to a Vulcan priest.
  
• The final scene shows V'Las meeting with Sub-Lieutenant Talok — revealed to be a Romulan operative — who denies him an escape… leaving re-unification for another time (see TNG two-part episode "Unification").