Romulan

First appearance: Star Trek: The Original Series "Balance of Terror" (1966)

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All sentient races in the galaxy have a good, healthy fear of the Romulans — and with good reason. In many ways, the Romulans are like the anti-Vulcans. In fact, Romulans are an offshoot of the Vulcan race. Centuries ago, the Romulans rejected the Vulcan idea of repression of emotions and struck out on their own, finally settling on the twin planets Romulus and Remus and forging an empire.

Where Vulcans are cold, collected, and benevolent, Romulans are fiery, aggressive, and often power hungry. This passionate need to conquer led to the Earth/Romulan war, the first time humanity experienced total war on an intergalactic scale. Earth was eventually victorious and, during the conflict, no human ever actually saw a Romulan. Years later, it was the crew of the Enterprise that actually saw what Romulans looked like and it was Mr. Spock that postulated a common ancestry between Vulcans and Romulans.

The Romulans were based on the aggressiveness and culture of the Roman Empire, which is seen through the race’s military aggression and clothing. Despite years of ill will, the Romulans sided with the Federation in the Dominion War. A Romulan also changed reality, as fans of the new Trek films know...

A Romulan named Nero used a Red Matter device to destroy Romulus and punch a hole in time and space. Nero then went back in time and destroyed the USS Kelvin, causing a new reality to splinter off from the original Trek timeline — a reality Trek fans are currently enjoying in films.

Romulans have touched every part of Trek history and have even created a huge amount of it. They continue to serve as a counterpoint to the Vulcans and their name brings fear and respect throughout the Trek galaxy.