One of two Klingon mercenaries employed by the Trill Verad in the episode Invasive Procedures to seize Deep Space 9 during an evacuation so that he can steal the Dax symbiont.
Yeto is a Klingon soldier of fortune who appears in the second-season episode Invasive Procedures. With his comrade T'Kar he has been hired by Verad, an unjoined Trill who was turned down for joining and has decided to take the Dax symbiont by force.
When a plasma storm empties Deep Space 9 of all but a skeleton crew, Quark lets the group's ship dock. The Klingons take the senior officers hostage in Ops and stand guard while Julian Bashir is made to transfer the symbiont from Jadzia to Verad.
Yeto is there for his fee and nothing more. The officers work to divide and overpower their captors, and the scheme collapses once Benjamin Sisko stops Verad from leaving and the symbiont is returned to Jadzia.