Aldus Boardman was born in 1915 to Joe and Edith Boardman, reincarnations of Prince Khufu and Priestess Chay-Ara. After hearing them speak of Vandal Savage at night, Joe and Edith decided to tell Aldus of their eternal cycle of reincarnation and their conflict with Vandal Savage. When Aldus was 10 years old, Savage once again found his parents. Aldus survived the encounter because his mother hid him in a closet and ordered him to remain silent. The resulting tragedy motivated Aldus to study everything he could about Savage, leading him to become a professor.
On April 8, 1975, Aldus recorded himself on a video tape in which he revealed his knowledge of Hath-Set/Vandal Savage, Khufu and Chay-Ara's origins. Aldus explained that Savage's immortality had come as a result of "unearthly calamity" and that anything related to that calamity would possibly reverse its effects. Aldus also expressed his belief that Vandal Savage was the greatest threat Earth would ever face.
According to history, Aldus would later die of unknown causes possibly at Savage's hands, which prompted rogue Time Master Rip Hunter to recruit a team and traveled back to October 17, 1975 to acquire information about Savage throughout history from Aldus before his death. By the time they entered his office, Boardman had dozed off and was assumed to have already died. Suddenly, Aldus woke up and was surprised to see the spitting image of his parents, their reincarnations Kendra Saunders and Carter Hall staring right at him, standing in his office. Rip then interrupted him, claiming to be a fellow historian interested in Vandal Savage.
Aldus went on to explain the origins of Savage's immortality, as well as his own personal history with Khufu and Chay-Ara. He then revealed Savage's meddling over the course of history, starting out conflicts for his eventual world takeover while keeping his anonymity. Aldus gave Rip a journal detailing all he had discovered about Savage in the hopes that they could stop him once and for all.
Suddenly, Rip got an alert that his timeship, the Waverider, was under attack. Despite its potential effects on the timeline, Kendra and Carter persuaded Rip to let them bring along Aldus. When they arrived, the timeship was under attack by Chronos. Aldus took cover as Rip's team engaged the temporal bounty hunter, all the while being amazed by Rip's "laser gun". Unfortunately, Aldus was critically injured during the crossfire and thus was brought on board for medical treatment. With his dying breath, Aldus bequeathed to Kendra his mother's ring.
Aldus' knowledge on Vandal Savage and Amon Dagger ultimately allowed Kendra and Rip to kill Savage in 2021 with the aforementioned weapon.