Wonder-kun no Hatsu Yume Uchuu Ryokou follows the friendship between Taro and the enigmatic Wonder‑kun. The story uses the motif of “the first dream of the New Year” as a backdrop. Guided by Wonder‑kun, Taro embarks on a space adventure in search of excitement. The production blends live‑action footage with animation and was aired by NHK during the New Year holidays as part of a program aimed at children staying home. The episode lasts 20 minutes, but the narrative portion is approximately 11 minutes, which is the duration reflected for the anime.