The Creation King, the pinnacle of the cult Gorgom. As his life begins to extinguish, the elected Creation King will inherit his power. On the night of their 19th birthday, stepbrothers Robert Akizuki and Stephen Akizuki were kidnapped by Gorgom and submitted to a mutant cyborg surgery to become the candidates for the next Gorgom Creation King. Both of them are called Century Kings and are destined to best each other in a final battle - whoever wins will become the next Creation King. Robert escaped before getting brainwashed (which is the final step in the surgery), with help from his foster father, and turned against Gorgom. He soon finds out the horrific truth from his stepfather: Gorgom originally killed his true parents and, since both Robert and Stephen were born on the day of a solar eclipse, are referred to as "Black Sun" and "Shadow Moon". Robert, taking on the name of Masked Rider Black, was determined to rescue his stepbrother from Gorgom while protecting Japan.
