Reporter Raymond "Ray" Terrill is investigating a group of government scientists who are developing a weapon using light, when he is attacked with a "genetic light bomb" that ends up bestowing him with light-based super powers.

Taking place on the alternate Earth, Earth-X, a world where the Nazis won World War II, Ray and his friends Black Condor, Red Tornado, and a handful of others fight against Nazi-aligned versions of popular Arrowverse Heroes including Green Arrow, Flash, and Supergirl, for the freedom of the world.