The ambitious leader of the Klingon Empire declares his goal of uniting all the great houses under one rule. Klingons can only unite for war, and this time humans have been declared as the enemy. Their traditional motto of "we come in peace" is not liked by everyone, especially when it comes to a race whose purpose in life is war. Meanwhile, Starfleet officers spare no time or resources to help a small species from an outer planet that has run out of water. Why not fly halfway across the galaxy for a single shot from a phaser? Clearly, humans have plenty of money if they spend it on such significant missions.
