The whole point of going back in time to 1975 was so that our Legends could speak to one Aldus Boardman just 24 hours before hes due to die. Boardman is seemingly the only person in the history of mankind who is an expert on the activities of Vandal Savage. The big twist here is that, not only does Boardman known all about Chay-Ara and Khufu, he reveals that he met them many years ago because they were his parents, Edith and Joe Boardman. Aldus would explain that Vandal Savage killed Edith and Joe when their son was just 10 years of age, and so hes dedicated his life to exploring the story of Chay-Ara, Kufu and Savage ever since.