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Ocelot - (Vameir) a beast given sentience by an ancient gemstone possessing a soul.

The Octagon - A team of eight super-villains whose ranks have changed over the years. Original line-up: Doctor Delirium, Geometric Man, Golden Greek, Madame Mammoth, Mimic, Prince Pyro, Shadow Dancer and Timewarp. Second line-up: Ecstasy, Geometric Man, Grid Iron, Live Wire, Shadow Dancer, Sub Zero, Timewarp, and Titan.

Octoman - one of Project: Genetics experiments, a man with four octopus tentacles.

Olympian gods - residents of Mount Olympus who were worshipped by the ancient Greece. Includes Zeus, Athena, Aphrodite, Hermes and more.

The Omni-Lords - a yellow skinned alien race of vast intelligence and curiousity.

Oshioto Electronics - a hi-tech corporation in Japan. Chu Nakatari was their CEO until his untimely death at the hands of Mechanon in 1990.

OUT - Organization of Undercover Terrorists. A long-running (since 1973) network of international operatives who work from the shadows.

The Outlanders - a team of cosmic heroes who spent time, breifly, on Earth. Members include: J'Nah M'rkovian, the Leprechaun, Masquerade, Sparx, and the Walker.