Kirk must defuse a Klingon scheme to destroy a grain shipment... and cope with a seemingly benign creature known as a tribble, which reproduces at amazing speed.

Bob Myles, Bob Orrison, Charlie Brill, David L. Ross, Dick Crockett, Edwin Reimers, Guy Raymond, Jerry Summers, Michael Pataki, Paul Baxley, Phil Adams, Richard Antoni, Stanley Adams, Whit Bissell, William Campbell, William Schallert