A Kazon-Nistrim who pretends to defect to Voyager with news of Seska's death, and whose suicide attack cripples the ship in time for Culluh's ambush.
Teirna is a follower of Maje Culluh of the Kazon-Nistrim. He appears in Basics, Part I, the finale of Voyager's second season.
After Seska sends a message begging for help for her newborn son, Voyager finds Teirna adrift and injured in a shuttle. He says that he was cast out for defending her, that she is dead, and that he can provide command codes to get the ship past Nistrim defences. The Doctor notes odd readings in his blood but finds no weapon.
The whole tale is a trap. As Kazon ships close in, Teirna sets off a reaction in his own body and explodes in his quarters, knocking out key systems. Voyager is boarded and the crew is marooned on Hanon IV.