While traveling to explore the Arachnid Nebula, the Enterprise surprisingly is saluted by the civilian Vulkan Starship Vahklas that asks for support. They are V'tosh ka'tur, Vulkans considered without logic because they give a different interpretation to Surak teachings and do not repress their emotions, trying to balance them with logic. The explorers have been for eight years in space and Captain Archer offers to help them. Archer assigns T'Pol to work in the exploration of Arachnid in Vahklas, and the Vulkan Tolaris tries to convert T'Pol to his principles, proposing a dangerous mind melt to share her inner emotions with him. Meanwhile Trip becomes close to the engineer Kov, whose father is terminal and wishes to contact his son.
"Fusion" discloses an interesting branch of Vulkans, the V'tosh ka'tur. The concept of merging of minds is a great and traumatic experience to T'Pol. However, based on the reaction of Tolaris, T'Pol seems to be partially right when she says that their principles are a reckless path to prime nature. But the resented Kov accepts the explanation of Trip that regret is one of the saddest emotions and follows his advice, contacting his father. My vote is eight.
Title (Brazil): "Fusão" ("Fusion")