|This article is about a/an episode in Kamen Rider Den-O.|
A bizarre Imagin boards the DenLiner, pushing around the other Imagin in order to be pampered and to protect his newborn host!
On the DenLiner, the Owner mentions that some of the other passengers are complaining of animal sounds and food disappearing. When he suggests that the noise may be Kintaros' snoring, Kintaros awakes and says he does not snore, but he feels a strange sensation and finds a small puppy has peed on his foot. The DenLiner crew chase the puppy, and they are led to what is supposed to be an empty train car filled with puppies, kittens, and a Swan Imagin holding a human baby.
Calling himself Sieg, the Imagin tells of how he came to form a contract to the baby, possessing Ryotaro with the Taros Imagin unable to get him out. Sieg reveals he intended to make a contract with a wealthy young woman half a year ago, but it turned out that she was pregnant and possessed her unborn child with no memory. When Sieg finally got his physical form, he had no memory of the contract's nature, and took his "brother" out of a truck when Ryutaros found him and brought him onto the DenLiner. Sieg, acting like a prince, orders the others to aid him in finding his "mother."
When Momotaros refuses with intent to beat him, Sieg shrinks him, Urataros, and Kintaros to around four inches in height and leaves with Hana. Meanwhile, Akio Matsuda, who had kidnapped the baby, Yūsuke, opens a contract with the Scorpion Imagin to find the mother, while Yuto and Deneb watch from a distance. With some unexpected assistance from Ozaki, Hana discovers the location of the mother, Shiori, at which Yuto and Deneb have followed the Scorpion Imagin.
They soon spot S-Ryotaro approaching the building as Sieg had remembered everything, and they are approached by the police who believe that he is the kidnapper. When the Scorpion Imagin attacks the Shori, Sieg leaves, and Ryotaro goes to save the mother as Den-O, only for the Scorpion Imagin to escape after nearly killing them both.
Ryotaro assures Shiori that Yūsuke is safe, and she passes out, just as the police arrive to take Ryotaro into custody.
- Ryotaro Nogami (野上 良太郎 Nogami Ryōtarō): Takeru Satoh (佐藤 健 Satō Takeru)
- Hana (ハナ Hana): Yuriko Shiratori (白鳥 百合子 Shiratori Yuriko)
- Yuto Sakurai (桜井 侑斗 Sakurai Yūto): Yuichi Nakamura (中村 優一 Nakamura Yūichi)
- Naomi (ナオミ Naomi): Rina Akiyama (秋山 莉奈 Akiyama Rina)
- Airi Nogami (野上 愛理 Nogami Airi): Wakana Matsumoto (松本 若菜 Matsumoto Wakana)
- Seigi Ozaki (尾崎 正義 Ozaki Seigi): Akira Nagata (永田 彬 Nagata Akira)
- Issē Miura (三浦 イッセー Miura Issē): Ryo Ueno (上野 亮 Ueno Ryō)
- Momotaros (モモタロス Momotarosu, Voice): Toshihiko Seki (関 俊彦 Seki Toshihiko)
- Urataros (ウラタロス Uratarosu, Voice): Kōji Yusa (遊佐 浩二 Yusa Kōji)
- Kintaros (キンタロス Kintarosu, Voice): Masaki Terasoma (てらそま まさき Terasoma Masaki)
- Ryutaros (リュウタロス Ryūtarosu, Voice): Kenichi Suzumura (鈴村 健一 Suzumura Ken'ichi)
- Deneb (デネブ Denebu, Voice): Hōchū Ōtsuka (大塚 芳忠 Ōtsuka Hōchū)
- Sieg (ジーク Jīku, Voice): Shin-ichiro Miki (三木 眞一郎 Miki Shin'ichirō)
- Owner/Opening Narration (オーナー／オープニングナレーション Ōnā/Ōpuningu Narēshon ): Kenjirō Ishimaru (石丸 謙二郎 Ishimaru Kenjirō)
- Akio Masuda (増田 明男 Masuda Akio): Tsuyoshi Muro (ムロ ツヨシ Muro Tsuyoshi)
- Shiori Takayama (鷹山 栞 Takayama Shiori): Kyoko Kano (鹿野 京子 Kano Kyōko)
- Yusuke Takayama (鷹山 祐介 Takayama Yūsuke): Taiga Watanabe (渡辺 虎雅 Watanabe Taiga)
- Police: Kei Tamura (田村 圭生 Tamura Kei), Tareyanagi (たれやなぎ)
- Driver: Akira Shinjo (新城 彰 Shinjō Akira)
- Scorpion Imagin (スコーピオンイマジン Sukōpion Imajin, Voice): Nobutoshi Canna (神奈 延年 Kanna Nobutoshi)
- Kamen Rider Den-O/Momotaros: Seiji Takaiwa (高岩 成二 Takaiwa Seiji)
- Urataros: Eitoku (永徳 Eitoku)
- Kintaros: Jirō Okamoto (岡元 次郎 Okamoto Jirō)
- Ryutaros: Toshihiro Ogura (おぐら としひろ Ogura Toshihiro)
- Deneb: Yoshifumi Oshikawa (押川 善文 Oshikawa Yoshifumi)
- Scorpion Imagin: Jun Watanabe (渡辺 淳 Watanabe Jun)
- Sieg: Naoki Nagase (永瀬 尚希 Nagase Naoki)
- Den-O: Sword Form, Axe Form
- As part of Super Hero Time, this episode aired alongside Juken Sentai Gekiranger episode 19, Lesson 19: Gokin-Gokin! Showdown with Rio.
- Viewership: 6.0%
- This is the first time since Episode 20 that Yuto doesn't transform into Zeronos.
- This episode debuts a new opening credits which features Zeronos.
Blu-ray Box 2 comes with 18 episodes.