Lethean

The Lethean were a humanoid species with telepathic abilities from the Alpha Quadrant. In the late 24th and early 25th centuries many could be found serving as mercenaries or in the Klingon Defense Force.

History
Letheans were known for their ferocity and stubbornness, but were thought by many to be unintelligent; a stereotype Letheans chose to exploit. Seeing the rising strength of the Klingon Empire in the late 24th century, many Letheans offered their services to J'mpok and the Klingon Defense Force. Though they have been seen throughout the Empire in the early 25th century, none had yet been granted citizenship by 2410.

By the time of the Galactic Union, at least a few Letheans had become Federation citizens and served in Starfleet.

Biology
Letheans were bald, with a vertical bone ridge that ran across their face and heads. Small bone protrusions often grew along this ridge and on their cheeks. Their skin was mottled and had multiple cartilage folds. The generally had a reddish tint to their eyes.

Known individuals

 * Aizur
 * Brokosh