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Official Site: Toei Company

is a Japanese tokusatsu superhero television series produced as part of the Kamen Rider series. The ninth show in the franchise, it is a joint collaboration between Ishimori Productions and Toei Company, and aired on the Mainichi Broadcasting System and the Tokyo Broadcasting System from October 23, 1988, to September 24, 1989. The series is 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!!. For distribution purposes, Toei refers to this television series as Black Kamen Rider RX.

This was also the last instalment of the Kamen Rider series to be produced in the Shōwa era and the first to be produced in the Heisei one — Episode 11 was delayed by one week following Emperor Hirohito's death.

The series was adapted by Saban in North America as Masked Rider. The show featured a heavily altered story and all-new characters, in an attempt to fit the series in as a spin-off of Power Rangers, but ultimately failed to catch an audience.

After the downfall of Gorgom, Kotaro Minami has gotten a job as a helicopter pilot in a business owned by the Sahara family, who have also given him a new home. Kotaro is later captured by the Crisis Empire and offered a place in their group. When Kotaro refuses, his King Stone is shattered, and he is thrown into space where the sun's radiation mutates his King Stone and he turns into Kamen Rider Black RX. With his new powers, he wages a one-man war against the Crisis Empire and thwarts their plans to take over Earth.

Crisis Fortress has not been a contender in any CBUB matches.