Kamen Rider Black RX was the ninth show of the Kamen Rider franchise, it was a joint collaboration between Ishimori Productions and Toei Company, and aired from October 23th 1988 to September 24th 1989 with a total of 47 episodes. The series was a direct sequel to Kamen Rider Black and the first to feature a team-up with the past Riders since the 1984 TV special Birth of the 10th! Kamen Riders All Together!!
The series was adapted by Saban in North America as Masked Rider. The Americanization featured a heavily altered story and all new characters, in an attempt to fit the series in as a spin-off of ‘the Power Rangers series.
This was the last instalment of the Kamen Rider Series to be produced in the Shōwa period and the first to be produced in the Heisei period—Episode 11 was delayed by one week following Emperor Hirohito’s death.
Half a year after the downfall of Gorgom, Kohtaro Minami has gotten a job of a helicopter pilot in a business owned by the Sahara family. Kohtaro is later captured by the Crisis Empire and offered a place in their group. When Kohtaro refused, his King Stone was shattered and he was thrown into space where the sun’s radiation mutated his King Stone and he mutated into Kamen Rider Black RX. With his new powers, he battles the Crisis Empire and thwarts their plans to take over Earth.