Stig Hallström was an officer of Starfleet who was assigned to Deep Space 9 in the 24th century. In 2385, Ensign Hallström was among the personnel to be assigned to Security Outpost Endalla One. Shortly after their arrival, the Vellidon approached Endalla and Hallström and Wheeler Stinson had to use the USS Tecyr to rescue the sole occupant, Nelish Stoat, before the Vellidon exploded. (DS9 novel: Sacraments of Fire)