Are Heisei Rider vs. Showa Rider: Kamen Rider Taisen feat. Super Sentai, Super Hero Taisen GP: Kamen Rider 3 and D-Video Special: Kamen Rider 4 canon or non-canon? Because Kamen Rider Den-O should not have been affected by the changes in the timeline. Heisei Rider vs. Showa Rider: Kamen Rider Taisen feat. Super Sentai clearly contradicts the final episode of Kamen Rider 555, and D-Video Special: Kamen Rider 4 does not fully clear up the ambiguous ending of 555's final episode in KRT. If they are canon, then they should immediately be re-confirmed as non-canon.