Lucky kid.
The Gorgom High Priests are trying to figure out Kamen Rider BLACK's weakness... even though these guys are the ones who created it. It made much less sense after one of the priest revealed that they created BLACK perfectly. Later, we meet a kid and her search for her old mechanical doll.
For starters, it doesn't make sense why Gorgom is trying to discover Kamen Rider's weakness even though these guys admit that they are the ones who made BLACK a perfect cyborg. Even if it doesn't make any sense, they were able to find out Kamen Rider, no more like Kotaro's weakness. Since we have a kid in this episode, the weakness is obviously, his human heart and how he cares for humans.
Because the said girl is looking for her doll, why not include it in the story and make it creepy? The end result is something that felt like it came straight out of some horror movie... and I like it. The horror elements made the episode really interesting, the use of lighting and how the special effects made the Gorgom High Priests look competent are the best parts of this episode. I mean, for the past few episodes, their plans often failed... even if there are times that they almost win. I repeat, almost win.
As for the girl, she ends up getting kidnapped by Gorgom and is trapped in some subspace created to kill Kotaro. Once he transforms in that place, it will explode and it will kill those inside this space. To make matters worse, Battle Hopper is inside of a cage! But this is when Kotaro becomes creative and used Battle Hopper's cage to deal some damage to the MOTW, who happens to control the plant where the girl is placed! In short, Kotaro just killed two birds with one stone. Now that the girl is free as well as Battle Hopper, it is time for the BLACK to finish the MOTW! At the end, the girl is safe with his family... and that's about it. This episode is not that interesting except for the fact that the little girl that Kotaro saved will end up becoming a magical girl in some anime.
