Incident on New Phaeton

The Constitution-class Federation starship USS Enterprise NCC-1701 visited the planet New Phaeton. Captain James T. Kirk beamed down to the planet with a landing party, leaving Spock in command. The landing party was exploring the planet when, suddenly, they got attacked by rock monsters. Sulu set his phaser-2 to kill. He vaporized all the rock monsters. The tricorder readings went back to normal. The landing party continued with their mission.