Rivera was a member of the Dominion Marine Corps, serving under Captain Veers and stationed on Maltair IV, serving as part of the bodyguard of Senator Corbin Phash. Rivera's job became slightly more interesting when the zerg invaded the planet however, Veers leading a retreat into a vespene gas mine. Seventy hours later, the zerg gained entry, Veers leading his men against the invaders.
Rivera survived a skirmish with the zerg but was killed during their retreat to a safe bunker.
Rivera may be named after Lucas Rivera, a letterer of StarCraft: Frontline (in which Rivera appears).