Ryo is actually also seen in the episode "Genesis of Evil" from Season 2 in the desert of the Digital World with Ken when the Dark Spore infects him.
If Kazu and Kenta are huge Digimon fans, then why didn't they notice that Ryo is on the show?
The reason why I think that Kazu and Kenta didn't know that he was in the Digimon shows was beacuse in the dub version you only see about 3 inches of his leg. So if you didn't know it was him. then I guess you could forget...but he was in the movie.
Rika: Is there anything except sand and wind in this stupid world? Renamon: Rocks? Rika: Helpful as always, Renamon. Remind me to get you a stand-up comedian upgrade card when we get home.
Guilmon (as Terriermon struggles against the wind): I think Terriermon's practising to be a mime. Henry: It'd never work. He'd have to be quiet to be a mime!
Terriermon: (While they are in the cave thing) It's not creepy. It's really really frightening!
This episode was published in the manga Digimon Tamers Volume 3.
Japanese Title: Friend Or Foe? Ryou Akiyama, The Legendary Tamer!
Ryo is the person that ties Digimon Tamers to the previous seasons.
Ryou's debut in the show was based from the fact he made a cameo of 2 in trhe previous series. So Konaka addd him in, giving a fanmade Digimon that had popularity, Cyberdramon.
Ryo is the also known as the Mysterious Tamer of Legend. He originally began life in the world of Seasons 1 and 2, but gained the power to cross through dimensions during his trips to the Digital World. Ryo remained in the Tamer's universe because of Cyberdramon-who was too dangerous to take anywhere else.
Debuts: Clockmon, Cyberdramon, Ryo (official appearance)
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