The delegate of the Alpha moon of Peliar Zel, whose people's energy tapping of the planet's magnetic field has brought them to the edge of war with the Beta moon.
Kalin Trose is the representative of the Alpha moon of Peliar Zel and appears in the fourth-season episode The Host, set in 2367.
The two inhabited moons have a long history of quarrels. Alpha has begun drawing energy from the magnetic field of the planet they both orbit, and the Beta moon, represented by Leka Trion, blames the project for serious damage to its environment. The Trill mediator Odan, whose family has settled their disputes before, is carried to the talks by the Enterprise.
When Odan's host body is fatally injured and the symbiont is temporarily placed in Commander Riker, Trose and Trion have to decide whether they will accept this unfamiliar face as the negotiator they trust. They do, and an agreement is reached before Riker's body gives out.