What 1966 animated series features villains such as Brak the catlike space pirate and a 7 foot green mantis?
Brak (character): Brak is a fictional character and supervillain on the 1966 Hanna-Barbera animated series "Space Ghost", portrayed as a catlike alien space pirate trying to conquer the galaxy. Zorak:  Zorak appeared as a 7 ft green mantis and is a foe of the show's titular superhero.
Space Ghost