A badly injured Romulan found on Galorndon Core in The Enemy, who dies aboard the Enterprise after Worf, the only compatible donor, refuses to give him a transfusion.
Patahk is a Romulan officer and one of two survivors of a small craft that crashed on the storm-swept Federation planet Galorndon Core. He appears in the third-season episode The Enemy, set in 2366.
An away team finds him unconscious and brings him to sickbay, where Beverly Crusher determines that he needs a transfusion of compatible ribosomes. Only Worf's cells match. Worf, whose parents were killed by Romulans at Khitomer, will not agree, and Picard declines to order him.
Patahk himself declares that he would sooner die than have Klingon matter in his body, and he does die. The death hardens the stand-off with Commander Tomalak, which is defused only when the other survivor, Bochra, is returned alive with La Forge.