Fuelled by his restored faith in humanity and inspired by Superman's selfless act, Bruce Wayne and Diana Prince assemble a team of metahumans consisting of Barry Allen, Arthur Curry and Victor Stone to face the catastrophic threat of Steppenwolf and the Parademons who are on the hunt for three Mother Boxes on Earth.

Through unlocked genetic memories that allow him to relive the adventures of his ancestor in 15th century Spain, Callum Lynch discovers he's a descendant of the secret 'Assassins' society. After gaining incredible knowledge and skills, he is now poised to take on the oppressive Knights Templar in the present day.