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Originally Posted by Fish Sandwich

Kamen Rider Taisen:

I still love this one. Ignoring the last ~10 minutes with the forced fight, this is one of the crossover films that really got good mileage out of the returning characters. The Takumi/Keisuke stuff, in particular, really worked for me.

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Kamen Rider 3:

This one I liked a lot less. Properly using the Black/RX transition was a nice touch, but the only thing about this film that left a lasting impression on me was the intrinsically goofy Hitler Youth Go-Kart Team.

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Originally Posted by Fredbob392

If I remember correctly, the justification is that when an Another Rider is created during the year the Kamen Rider was created, the Another Rider overwrites the Kamen Rider's timeline, undoing everything that happened in the show

That was the rule for the first half of the show. Then the writers got bored of it and went with more conventional team-up cameos.