Andorian

First appearance: Star Trek: The Original Series "Journey to Babel" (1968)

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The Andorians are an aggressive yet advanced race that was one of the first alien races that formed the original Federation of Planets with humanity.

The Andorians have distinctive blue skin, white hair, and two protruding antennae. The blue skinned humanoids have an advanced armada and a long history of conflict with the Vulcans. This conflict was put aside as Andorians entered into the Federation and, with it, decades of peace. But peace wasn’t easy, as seen in Star Trek: Enterprise, in which Federation Captain Archer and Andorian Captain Thy'lek Shran developed an adversarial relationship that, thankfully, culminated in a friendship based on mutual respect.

The Andorians are more than a bit xenophobic as they refer to humans and Vulcans as "pink skins" and have a long standing mistrust of everything not Andorian. In fact, the Andorians don’t even trust their offshoot race, the very rarely encountered, white-skinned, psychic Aenar.