An episode of the Original Series of unknown number.
On the planet Avsnoyl, the crew encounters an amiable race of folks. Soon the Commander discovers that their new-found friends are merely after their stock of virrilium combustible. When the Protector refuses to give them their fuel, the Avsnoylians turn violent. At the end of the episode, in a terse, chess-like confrontation, the Commander must justify to NSEA Headquarters why he needed to obliterate such seemingly "benign" life-forms.