Pre-series
Series
Post-series
- 2009: In the World of Decade, Den-O fights with the other Kamen Riders to defeat Dai-Shocker. (All Riders vs. Dai-Shocker)
- 2011: In an Alternate Timeline where Shocker conquered the world in 1971, Den-O is among the Kamen Riders who reappear to defeat Shocker and its Great Leader. (Let's Go Kamen Rider)
- 2012: Den-O is among the many Riders who apparently defeated by Captain Marvelous (Gokai Red), Emperor of Dai-Zangyack which seeks to wipe out the Kamen Riders, opposing Dai-Shocker led by Great Leader Tsukasa Kadoya (Kamen Rider Decade) who are hunting the Super Sentai. Infact, all the presumed deceased Riders and Sentai had been transported to the dimensional rift, from which they emerge to defeat the new Shocker-Zangyack Alliance. (Super Hero Taisen)
- 2013
- Den-O joins in the battle against Space Crime Syndicate Madou's army of revived monsters. (Super Hero Taisen Z)
- Den-O, among the first 15 Heisei Riders, is summoned to World within the Magic Stone, where he helps to defeat the evil wizard Amadum and his army of monsters. (''Wizard ep. 52-53)
- 2014: Den-O participates in the battle to defeat the Underground Empire Badan, as well as the brief conflict between the Heisei Riders and Showa Riders. (Kamen Rider Taisen)
- 2015: In an Alternate Timeline where Shocker conquered the world in 1973, Den-O serves Shocker before his brainwashing is reversed, joining the other Riders in the fight against Shocker before the timeline is restored. (Super Hero Taisen GP)
