The Galileo Seven

S1, E16: Sent to investigate the mysterious solar system of Murasaki 312 by Captain Kirk, Mr Spock and the crew of his shuttle craft find themselves losing contact with the Enterprise when all communication systems are made inoperable by a mysterious force. Crash landing on the hostile planet of Taurus II, Mr Spock and his crew are attacked by a giant creature bent on destroying them. Is Mr Spock's first command doomed to be his last?