Kamen Rider Black RX is the second TV [mini] series featuring Kamen Rider Black.
Here's a quick synopsis of the show: Half a year after the downfall of Gorgom,
Kotaro Minami has gotten a job of a helicopter pilot in a business
owned by the Sahara family. Kotaro is later captured by the Crisis Empire
and offered a place in their group. When Kotaro 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.
He also appeared in the US version of the show called Masked Rider (although the story wasn't quite the same as the Japanese version and was probably even worse than Saban's version of the Sentai (Power) Rangers.)
This version however is coming from Bandai and SH Figuarts, which means it's all based off of the original Japanese series.
To accompany Black RX will be his cycle, the Acrobarar (sold separately).
Prices and release dates to be forthcoming.