In the episode "Unity", Kaplan and Commander Chakotay are on their way back to Voyager after taking a shuttle to scout the Nekrit Expanse. One the way back, they recieve a distress call from a nearby planet and land to investigate. The planet is inhabited by former Borg drones who escaped from the Collective and became divided into different factions. When Chakotay and Kaplan encounter one of the factions, they turn out to be hostile and attack. Kaplan is struck by a disruptor blast and killed.