Alien Boy (少年宇宙人 Shōnen Uchūjin) is the 20th episode of Ultraman Dyna.
In the Kerigan Star System, space satellite Teto recorded the icy planet Lasesta assimilated into a bigger planet Vividra. Mrs. Kishi saw this incident in the news and reported it to her son, Satoru. While studying the abnormality on Planet Vividra, Super GUTS received a brief alien signal.
At the playground, Satoru confessed his true nature as an alien to his two friends, Minocchi and Tacchan with his brief exposure alarmed Super GUTS again. The two boys however remain loyal to their friendship and promised to keep the Lasesta's presence as a secret. Satoru recalled that long ago, Planet Lasesta entered a glacial period and forced its inhabitants to migrated across the space, taking on disguises based on whatever natives of the planet they situated on. Since then, the race had established two oaths; 1) they will return to Lasesta if the planet finally thawed out and 2) if the Lasesta was destroyed, children who reach the age of 5 Lasesta years (10 Earth years) will return to their original forms and regroup at a rendezvous point (Iris of the Rangifer constellation) to search for a new home planet. Should a young Lasesta refuse to revert to their true form, they will permanently stuck in their disguises for the rest of their lives. In addition to his mother, his late father and grandfather had also lived on Earth for a very long time
When Satoru accidentally transformed into his true form, his mother telepathically alerted him of Super GUTS' arrival but his friends were able to cover him at the last minute. The three decided to visit a shrine where Satoru met Asuka, whose already know of his true identity and purpose. At night, the three boys broke into a research center and the other two bid their farewell as Satoru transformed, but was incapable of flying, let alone being frightened by the Super GUTS' GUTS Eagles. When the team falsely assumed Tacchan and Minocchi were in danger, they open fired and this forced Asuka to transform to save the alien.
"No one knows your future. Do you know why? That's because its for you to create. [...] That's right. No matter where, no matter when, your future is yours to create with your own hands. Let's go"
- ―Ultraman Dyna.
By assuring Satoru of his own future, Dyna guide the alien in his way out of the planet. Tacchan and Minocchi decided to become astronaut and scientist in the future in hopes of reaching Satoru.
- Shin Asuka (アスカ・シン Asuka Shin): Takeshi Tsuruno (つるの 剛士 Tsuruno Takeshi)
- Gousuke Hibiki (ヒビキ・ゴウスケ Hibiki Gōsuke): Ryo Kinomoto (木之元 亮 Kinomoto Ryō)
- Toshiyuki Kouda (コウダ・トシユキ Kōda Toshiyuki): Toshikazu Fukawa (布川 敏和 Fukawa Toshikazu)
- Ryo Yumimura (ユミムラ・リョウ Yumimura Ryō): Risa Saito (斉藤 りさ Saitō Risa)
- Kouhei Kariya (カリヤ・コウヘイ Kariya Kōhei): Takao Kase (加瀬 尊朗 Kase Takao)
- Tsutomu Nakajima (ナカジマ・ツトム Nakajima Tsutomu): Joe Onodera (小野寺 丈 Onodera Jō)
- Mai Midorikawa (ミドリカワ・マイ Midorikawa Mai): Mariya Yamada (山田 まりや Yamada Mariya)
- Narrator (ナレーター Narētā): Yuji Machi (真地 勇志 Machi Yūji)
- Satoru Kishi (岸 悟 Kishi Satoru): Hiromi Sakimoto (崎本 大海 Sakimoto Hiromi)
- Satoru's father (photo cameo): Takehiro Kuramochi (倉持 武弘 Kuramochi Takehiro)
- Satoru's mother: Megumi Ishii (石井 めぐみ Ishii Megumi)
- Tatsuo (辰雄Toshiyuki Toyonaga (豊永 利行 Toyonaga Toshiyuki) ):
- Minocchi (みのっちYamada Takaho) ): Takaho Yamada (山田 孝穂
- Ultraman Dyna
- Flash Type
- Ultraman Dyna Volume 5 features 17-20.
- This episode coincidentally aired in the same day as the final episode of GaoGaiGar anime in Japan.