DC's Legends of Tomorrow (2016)

S1E13 Leviathan

Rip leads the team to London in 2166, just three months prior to the tragic murder of his family. He views this as their last chance to eliminate Savage, who is currently at the peak of his strength. As they delve deeper into their mission, the team uncovers two crucial aspects necessary for dismantling Savage: the existence of his daughter and a definitive method to end his life for good.