A series-5 Long-range Tactical Armor Unit
The Series-5 Long-range Tactical Armor Unit was a highly advanced torpedo designed by the Druoda, a Delta Quadrant species. It was in use as late as 2375. At just over one meter long, the torpedo was a weapon designed for mass destruction. Its explosive yield consisted of a highly focused anti-matter explosion with a blast radius of 200 kilometers.
The armor unit was powered by a condensed energy matrix, which alone could power a fleet of starships. Instead of a standard computer core, there was an onboard class-11 artificial intelligence which used bio-neural circuitry to mimic humanoid synaptic functions. The intelligence was programmed to take every measure necessary to ensure that it reached its target. When separated from its explosive components and reprogrammed, it could be used to regulate a planet's weather grid or terraforming purposes.
The weapon was warp-capable and had a maximum range of eighty light-years, and was protected by paratrinic shielding. Its sensors were able to detect its position and when its systems were being tampered with. The torpedo was programmed with a targeting threshold of two light-years, meaning that when it was within two light-years of its target it could not disarm or divert — not even with the correct command codes. However, the detonation sequence could be stopped by routing a electromagnetic pulse through its power matrix.
In day-to-day operations, these torpedoes were controlled by the Druoda Strategic Command Matrix. Commands to launch or abort missions were sent to the torpedoes through the Matrix.
One of these weapons was found by the USS Voyager while answering a distress call emitted by the torpedo in 2375. The weapon's bio-neural circuitry was malfunctioning and it believed itself to be an organic being, claiming it could not remember what its mission was. After the ship's holographic Doctor beamed it to sickbay, the device supressed the Doctor's programming and took control of his holomatrix. It then revealed its purpose and demanded that Captain Kathryn Janeway take it to its target or it would destroy Voyager.
After unsuccessful attempts to deactivate the warhead, Ensign Harry Kim discovered that the warhead was one of a small contingent that had, in fact, been ordered to stand-down by the Strategic Control Matrix. After successfully convincing the weapon's AI of the validity of its orders, Harry Kim and the AI attempted to convince the other warheads of the mistake. However, as they had passed the two-light-year thresold, after which nothing could cancel the attack, the AI requested that it be beamed out to join the others. Voyager released the weapon and, after it and its fellows had gone to warp, it detonated itself amongst the remainder of the malfunctioning warheads, destroying them all. (VOY: "Warhead")