Dr. Sinister is a mad scientist, a one-time character, the titular villain and the main antagonist of the episode of the same name, featured in the fifth season of the original series, The Flintstones.


Dr. Sinister is a cruel, dangerous, ruthless, power-hungry, evil, and villainous mad scientist who wants to destroy the world with his World Destruction Machine, the most powerful and deadly invention ever.

Physical Appearance

Dr. Sinister is slender with green skin, a pointy head, a long nose and elf-like ears with thick black half moon-shaped eyebrows, a little tuft of red hair and red claw-like fingernails on his hands. Also, he wears a black circular glasses on his head and a black cloak.


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