A species of traders and mercenaries whose freighter was to receive three high-ranking Romulan defectors, until the plan collapsed in Face of the Enemy.
The Corvallens feature in the Next Generation episode Face of the Enemy. They are known as mercenaries who will carry cargo for anyone who pays, which made one of their freighters a convenient link in a plan by the Romulan underground to smuggle Vice-Proconsul M'ret and two aides, held in stasis, out of the Empire.
In 2369 Deanna Troi is surgically disguised as a Tal Shiar officer and placed aboard the warbird Khazara to supervise the transfer. When the Corvallen ship arrives she senses that its captain is hiding something and cannot be trusted.
Her contact, Subcommander N'Vek, destroys the freighter with all hands on his own initiative to protect the secret. The loss forces Troi to improvise a far riskier route to the Federation, pitting her against the warbird's commander, Toreth.