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Quote:

Originally Posted by Dr Kain

They were in W, they were in Fourze, and they were in the OOO/Fourze movie. I'm quite certain that is a story arc.

It kind of sucks because Toei made it seem like we were going to start having a shared universe again with Kamen Rider, but nope, then they got scared and wanted to go back to status quo.

Foundation X was the pet project of W and Fourze's producer. When he wasn't in charge nothing happened with them because the other producers didn't care. It was a neat idea, but I think a lot of fans built Foundation X to be way bigger and more important than they ever were.