Automatic bridge defense system

The Automatic bridge defense system was a security system present on the USS Enterprise in 2269. It was used by the Magnetic organism in an attempt to coerce the crew of the Enterprise into doing its bidding. (TAS episode: Beyond the Farthest Star)

This device is spherical and approximately 30 centimeters in diameter. It has an internally powered antigrav locomotion system, infrared sensors, and the equivalent of a Phaser II weapons system. It normally remains in an unoccupied corner of the bridge until a the vessel goes the General Quarters Three. At that time, it automatically stations itself near the ceiling, where it can fire on any point of the bridge. (FASA RPG module: Star Fleet Intelligence Manual: Agent's Orientation Sourcebook)