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Klingons are a war-like race from the planet Kronos.

Klingons are a war-like race from the planet Kronos.

In the [[Star Trek (original series)|original series]] Klingons were often enemies of humans, but in later series a truce has been reached.

In the [[Star Trek (original series)|original series]] Klingons were often enemies of the Federation.  In ''Star Trek VI: The Undiscovered Country,'' the Klingons and the Federation begin peace talks.

The best-known Klingon is [[Worf]], the security officer on the U.S.S. ''Enterprise''-D of ''Star Trek: The Next Generation''.

The best-known Klingon is [[Worf]], the security officer on the U.S.S. ''Enterprise''-D of ''Star Trek: The Next Generation''.