Bioweapon

A Bioweapon is a term used to describe a living thing that was captured or created for the purpose of use in battle or warfare against its will. According to Samus Aran and Adam Malkovich, the use of bioweapons is "striclty prohibited" and "illegal".

The Bottle Ship incident
In its later days, the Galactic Federation had a history of using bioweapons, most notably the creation of Metroids and multiple other species on the Bottle Ship, which were cloned to be used as weapons from fragments of DNA found on Samus' Power Suit after her mission on planet Zebes. However, these experiments were done in secret, and as such was not supported by the majority of the Federation, but rather a "small group" that used a reported written by Adam Malkovich as the basis for their operations.

When the secretive part of the Federation discovered how successful their Metroid cloning operation had become, they decided to "delete" the majority of the facility, in favour of the area where the Metroids were being propogated; Sector 0. Unfortunatley for them, the chairman of the Galactic Federation had plans to send a squadron to the Bottle Ship investigating a distress signal emanating from there. It was then descided that they would place a worm amongst the squadron to prevent the others from finding out about the true nature of the facility, and kill any remaining survivors. This Deleter would also remove any traces of the previous plan to create a force modelled on that of the Space Pirates. Another complication soon presented itself though; the Bounty Hunter Samus Aran had also responded to the distress signal, threatening the Deleter's mission. This also made her a target. Samus was successful in discovering the true nature of the Federation's plans, however, and along with Anthony Higgs and Adam Malkovich's sacrifice, put an end to the Federation's twisted plot to turn Metroids into a force of power.

Space Pirate bioweapons
Space Pirates, who seemingly have no regard for any laws but their own, have no objections to using bioweapons. In fact they frequently enslave other species for their plans. One example is the Preed, thought to be a cybernetically enhanced species of Puffer, bred to patrol areas of importance for the Pirates. The Pirates also experimented with Phazon, forcibly infusing it with many other species in attempts to create powerful weapons for battle.

Galactic Federation

 * Metroids
 * Ridley
 * Nightmare

Space Pirates

 * Preed
 * Phazon-infused beings