Automatic Bridge Defense System deployed
The system fires on Spock
The automatic bridge defense system, as its name suggests, is a defensive system found on the bridge of Federation starships around 2269. It fired a phaser-like weapon.
When a malevolent lifeform took control of the Enterprise in 2269, it tried to use the system to force the crew's obedience. (TAS: "Beyond the Farthest Star")