Empathological Fallacies

The Cerritos escorts three Betazoid diplomats. Disliking her time on the ship, T'Lyn drafts a request to return to her former ship, the Sh'vhal. The Cerritos crew begin behaving in an unhinged manner, and Freeman suspects the Betazoids have Zanthi fever, a telepathic disease that affects others' emotions. The Betazoids object to Freeman's treatment of them, reveal themselves to be undercover intelligence officers, and seize control of the ship. T'Lyn realizes that her conflicting emotions over her transfer to Starfleet are being telepathically projected to the crew and feels she has failed as a Vulcan. Mariner helps restore her self-confidence, quelling T'Lyn's emotions and returning the crew to normal. She decides to remain on the Cerritos. Meanwhile, an overworked Boimler wants to train with the ship's security team and is frustrated when they just play games.

Summary from Wikipedia, CC BY-SA 4.0.