Professor Monster

Professor Monster is the leader of the Iron Cross Army, the one who destroyed Planet Spider, the archenemy of Takuya Yamashiro/Spider-Man and the main antagonist of Toei's 1978 Spider-Man tokusatsu series.
He is played by the late Mitsuo Ando who is more well known for playing Professor Gill in Android Kikaider and Kikaider 01, Führer Geisel in Inazuman Flash, the Black Cross Führer for the first 56 episodes of Himitsu Sentai Gorenger.