The plot:
Thousands years ago, a mysterious someone had turned all Ultra biengs, aliens, and monsters into Spark Dolls using a device called Darkness Spark.
Today, high school student Hikaru came back to the village where he was born and he found out his grandpa's shrine was destroyed by a sudden fire. However, the Shintai was saved and moved to an abandoned school. Hikaru decided to squat in the school to continue take care of the Shintai for his grandpa. One day, Hikaru meets a talking doll named Ultraman Taro. It told Hiakaru that he is the "selected one."
There were countless Spark Doll hidden in the village and they're now being awaken by the Galaxy Spark which was being worshiped as the Shintai cared by Hiraku.
Taro is the only Spark Doll that has self-conscious and can act on his own will. He serves as Hikaru's mentor and the narrator of the story.
(It's Taro's 40th anniversary btw.)
Alien Baruki acts as an agent of the mysterious someone. He hands the Darkness Dummy Spark and Spark Dolls to individuals who have a corrupted mind.
In conculusion, this is Tsuburaya's take on string Ultraman, Gokaiser, and Shounen Manga all together.:laugh: