A member of Vosk's faction of Na'kuhl time travellers, who worked among the German forces occupying part of the United States in an altered version of 1944.
Ghrath appears in the fourth-season Enterprise story Storm Front, played by Tom Wright. He belongs to the group of aliens from the future who, having become stranded in the 20th century during the Temporal Cold War, struck a bargain with Nazi Germany.
The Na'kuhl supply advanced weapons to the Germans and in return receive the materials and labour needed for a huge time conduit that will take them home. Ghrath serves Vosk in this work and in dealings with the increasingly impatient German officers.
The scheme ends when Archer and the crew of Enterprise destroy the conduit, wiping out the altered history in which Ghrath and his comrades operated.