Born with an ingenious mind and remarkable intelligence, Dell Conagher is the only son of Fred Conagher, the Engineer from the Team Fortress Classic series. In 1968, Dell was hired as a mercenary to fight on either RED or BLU during the Gravel Wars. In 1972, after Gray Mann took over Mann Co, Dell was fired along with the rest of the mercenaries. Shortly after being fired, he left for parts unknown. As of now, Dell's whereabouts are unknown, even to the rest of his team. Six months later, he began to take care of a now messy-haired Administrator in her secret quarters. As her life and health began to fail, Dell installed a small life extender machine into her arm so that she could continue to live to settle an "old debt". He would later, install a second and more improved life extender machine (which he called the Mark Five), as the previous one is not working well. Later, he called the Administrator's assistant Miss Pauling, saying that he needs the cache of Australium from New Zealand, which is what the Administrator needs. Because the Engineer's ingenious devices are under constant threat from explosives and devious enemy Spies, a good Engineer must keep his gear under a watchful eye and repair with them his wrench at all times. When the Engineer needs to get his hands dirty, his trio of generic yet capable weapons, along with the assistance of his helpful hardware, make him more than capable of holding his own in a fight. If need be, the Engineer can pick up and haul constructed buildings to redeploy them in more favorable locations.