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Quote:

Originally Posted by Kurona

All Showa seasons except Black and Amazon feature all the past Riders re-appearing in a few episodes, but it's not some sort of hard continuity thing where you need to have watched all the past shows to understand or something. They're in RX but all you need to know really is that they're past heroes.

And in RX, in particular, they just kind of show up randomly out of nowhere and none of them ever get out of their hero suits. All you really need to know is that A) they’re other Kamen Riders and B) Skyrider is Amazon.