Who is the enemy of the Klingon's?!

Question: Who is the enemy of the Klingon's!?
Answers:

At various times, The Romulans, the Dominions!.

You might like this website:
http://hubpages!.com/hub/Enemy_Races_of_t!.!.!.

Wikipedia has numerous articles on Star Trek too:
http://en!.wikipedia!.org/wiki/Star_trekWww@Enter-QA@Com

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