Another show that has had two version made – a 1968 series and a 1980 series. The above video taken from the sixties version obviously. Adapted from a manga by Hiroshi Fujimoto, one half of Fujiko Fujio (best known for Doraemon), it's the story of the Prince of Monster Land sent to Earth to train to be the King. He's accompanied in his adventures by a Wolfman, a Frankenstein's Monster and a Dracula.
Again, this is a show I have never seen. I have to say I do really like the character designs shown in the opening credits.