Abarca was a Qomar mathematician who was working aboard a Qomar transport in 2376 when the USS Voyager's scanning beam damaged their propulsion system. While aboard, he was very unhappy with The Doctor, a "primitive holographic construct." He even suggested to Tincoo, an associate of his from their ship, that they try to reprogram him, and deactivate his vocal subroutines. However, his opinion of him changed when he heard The Doctor hum a song. Abarca was played by actor Ray Xifo. His name comes from the script.