Legends of Tomorrow: S1:E1
In the year 2166, Vandal Savage has successfully conquered the entire planet.
In an effort to save humanity, time traveler Rip Hunter travels back to the year 2016 to assemble a group of superheroes and supervillains to team up and stop Savage's rise to power: Ray Palmer, Sara Lance, Jefferson "Jax" Jackson and Dr. Martin Stein, Mick Rory, Leonard Snart, Carter Hall, and Kendra Saunders. With the team assembled, Hunter takes them to 1975 to talk to Professor Boardman, a leading expert on Vandal Savage, to get assistance in locating Savage. While providing information on Savage, Boardman also reveals that he is the son of Kendra and Carter from one of their past lives. Meanwhile, a time-traveling bounty hunter named Chronos attacks Hunter's ship, the Waverider. The team is able to regroup and escape, but not before Professor Boardman is wounded and dies. The attack forces Hunter to reveal that Chronos is after him for stealing the timeship and going on the mission against the wishes of the Time Council and that part of his quest is based on his desire for revenge on Savage for murdering his wife and child in his time and seeks to avert the event.