A non-human crewman aboard the Enterprise-A in 2293, briefly suspected of murdering Chancellor Gorkon when gravity boots are found in his locker, until his feet are seen.
Crewman Dax appears in Star Trek VI: The Undiscovered Country. After Gorkon is killed aboard Kronos One by two figures in Starfleet suits and magnetic boots, Spock has the Enterprise searched for the evidence.
Chekov finds a pair of gravity boots in a locker and its owner, Dax, is called forward. The triumph is brief. Dax's feet are broad and webbed and could never have fitted the boots, which have plainly been planted there to mislead the search.
The false trail helps to convince Spock that the conspirators are still aboard and have help. The character has no connection with the Trill symbiont of the same name introduced later in Deep Space Nine.