Captain’s log: stardate 4187.3 Larry Niven adapts his story The Soft Weapon to become a Star Trek episode in this tale that first aired 15 December 1973. The race is on when Spock (Leonard Nimoy), Uhura (Nichelle Nichols) and Sulu (George Takei) discover an ancient weapon. The come up against the cat-like Kzinti who want…