The Swarm of the Torrasque is a Zerg mercenary group led by the Wise Old Torrasque, somehow maintaining its independence from Infested Kerrigan's control. It features all the Zerg strains along with Empress Queens, which are basically upgraded versions of their counterparts.
At some point after the Brood War, the group offerred its services to the Terran Dominion to deal with the New Trinidad Pirates.
See Also
References
1999-03-26. StarCraft. Vivendi Games. Mission: Mercenaries (in English). Map Archives: Mercenaries. StarCraft Compendium Map Archives.