|This article is about a/an webisode in Kamen Rider Decade.|
That One! Jun Watanabe: The Identity of Child X? (どれだ！渡辺淳 チャイルドＸの正体は？ Dore da! Watanabe Jun Chairudo Ekkusu no Shōtai wa?) is the sixteenth episode of the webisode series, Kamen Rider Decade: All Riders Super Spin-off.
Kenichi introduces Jun Watanabe, a suit actor who debuted in Kamen Rider Hibiki as Todoroki and went on to do Dark Kabuto and Sasword before making his break as a Sentai Ranger actor with Go-On Gold. He also portrayed Apollo Giest in the Decade TV show and Kamen Rider 1 in the movie. Narutaki states Jun's appeal is his experience with main Riders and a "fresh" approach to acting.
The Quiz line up is: Rider 1, Dark Kabuto, Sasword Masked Form, Sasword Rider Form and Todoroki
Out of the blue, Kenichi makes Narutaki choose the answer despite Tsukasa buzzing in. Narutaki oddly says Tiger, despite him not being in the line up.
It is revealed that Jun is in the Todoroki suit, Jun asking the producers to use his son Taiga again in another Kamen Rider production. Narutaki then remembers an episode of Den-O featuring Jun's then infant son and both he and Kenichi ponder if Taiga will follow in his father's footsteps someday in the future to become part of the next generation of suit actors.
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