The commander of a Nasari warship that exchanges fire with Voyager in 2373 after Harry Kim, acting on an inexplicable instinct, shoots first.
Alben is a captain of the Nasari, a Delta Quadrant people at odds with the neighbouring Taresians. He appears in the third-season Voyager episode Favorite Son.
When Voyager meets his ship, the encounter seems peaceful until Ensign Kim, seized by a sudden conviction that the Nasari are about to attack, fires on them without orders. Alben retaliates, badly damaging Voyager, and pursues it to the Taresian homeworld.
The Taresians claim Kim as one of their own, and Alben's hostility appears to confirm their story. In truth the Taresians have altered Kim with a retrovirus to lure him as a mate, and the Nasari have good reason to distrust them. Voyager escapes while the two sides fight.