Villain of the Week- Shinigami Sensei, AKA Dr. Death!

From the Villains Wiki- Dr. Shinigami is a leading scientist of Shocker serving as one of their high commanders and a major antagonist in the Japanese TV series Kamen Rider. He has extensive knowledge of both science and mysticism, which he uses to aid Shocker in their campaign for world domination. Through his cybernetic modifications, Shinigami has the power to transform into the squid kaijin Ikadevil.

Summoned from Switzerland, Dr. Shinigami took command of Shocker's Japanese branch after Kamen Rider 2 destroyed Colonel Zol. He is mostly seen in his cape, holding a wand. His initial scheme involved detonating a volcanic area in Japan to spread chaos throughout the region. He tasked the kaijin Snowman to carry out the attack, but the monster was destroyed by the Double Riders.

He is able to transform into Ikadevil, a squid monster. In episode 68, he kidnapped Tobei Tachibana and forced him to train him so he can destroy Kamen Rider 1. As a result, Tobei discovers his weak spot: Ikadevil's head! When Kamen Rider 1 came to challenge him, Dr. Shinigami discards his cape and becomes Ikadevil to deal with Ichigo once and for all. Kamen Rider 1 overpowers Ikadevil by giving a Rider Chop on his head, and finishing him off with Tailspin Shoot. He is briefly brought back to life for a Destron operation, thinking he was to replace Doktor G, along with the other Shocker and Gel-Shocker officers. He along with the other resurrected officers is killed when the Destron base they are in self-destructs. Back to me:

829. How AIP Makes a Monster (movie, 1958)!

Here is a semi-sequel that actually has a thoughtful plot behind it, even if the malefactors don't see things properly.