|This article is about a/an episode in Hikari Sentai Maskman.|
The Black Shadow of the Misty Valley (霧の谷の黒い影 Kiri no Tani no Kuroi Kage?) is the twenty-first episode of Hikari Sentai Maskman. It is the second of a three-part story, introducing second mecha Galaxy Robo.
With Great Five buried underground, Sugata decides to investigate a rival mecha that has gained infamy for killing its creator.
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- Galaxy Robo was introduced in this episode.
- In this episode, Commander Sugata reveals to Takeru and the group about his late best friend, Dr. Yamagata who is the creator of both Great Five and the Galaxy Robo.
- Dr. Yamagata's daughter, Yumi appears in this episode who becomes growing distant towards Commander Sugata due to the accidental death of her father. But this soon changes when Sugata convinces her to use her father's creation the Galaxy Robo which she reluctantly agreed until he asks her about her visitation to her father's grave where she hears her father's voice.
- It also reveals that Dr. Yamagata's voice was recorded before he was blown in explosion on the Galaxy Robo's cockpit to death as Yumi and Commander Sugata realize Yamagata's dying wish.
- In the Philippine Dub, Dr. Yamagata and his daughter Yumi are voiced by unknown voice actors which it was not seen in the list of casts in their second Facebook account.
Hikari Sentai Maskman Volume 3 features episodes 21-30.