First Appearance: "MESSAGE IN A BOTTLE"
Physical Attributes: Humanoid.
The Hirogen are a race of nomadic hunters who travel through the Delta Quadrant and communicate through an immense network of relay stations that extends to within communications range of the Alpha Quadrant. The relay network is at least 100,000 years old; each module uses a quantum singularity as a power source and produces an intense gravitational field.
Ketrics are a Hirogen unit of measurement used for interplanetary distances.
Hirogen ships use monotanium armor plating.