Star Trek: The Fearful Summons

Captain Sulu of the U.S.S. Excelsior and his crew are kidnapped. When Federation-conducted negotiations come to a standstill, Captain James Kirk and the former officers of the U.S.S. Enterprise™ reunite to rescue their old comrade.
The officers learn carrying out their mission could prove difficult when they encounter the kidnappers -- a greedy little-known race called the Thraxians, who believe their way is the only way. Now the Thraxians are demanding super-powerful weapons in exchange for the hostages.

With no other alternatives, Kirk is forced to consider giving in to the Thraxians to save the Excelsior crew -- a decision that could save a few, but endanger the lives of an entire star system...