This race of humanoid females lacks a home world and resorts to the cultivation of garden-like starbases scattered throughout space. Since Syreens are barred from recruiting from colonies, they resort to seizing "volunteers" from colony worlds which they conquer. Syreens rely upon weapons of allure and hypnosis to achieve their wicked Alliance aims.

Talking Pets recorded this exchange of an unsuccessful crew transfer between an Earthling Cruiser and a Syreen Penetrator:

Earthling Cruiser Zybernaught loaned a Syreen Penetrator six crew members in an exchange approved by the Alliance's Commander-in-Chief. This experiment used the flexible humanoids as a test for possible multilateral crew exchanges between Alliance races. Zybernaught's Captain Zeke Ziniovic reported no difficulty recruiting volunteers for the exchange program. 'They lined up to board the transfer vessel. I had to separate a few of the boys who got caught up in hormonal overload.' The transfer was effected, and after a few days, a strange thing occurred: Volunteers began to send distress calls from the Penetrator hostess ship. Requests to return were issued almost hourly, until the Crusier's Space Dinghy was sent to take three volunteers back to the mother ship. When the dinghy docked, the returned lads entered the main crew compartment gingerly. Unshaven, bleary-eyed and staggering, they immediately sought out the Crusier's dispensary. Captain Ziniovic immediately radioed the Penetrator hostess ship, demanding the return of the remaining volunteers. The Penetrator's response: 'Volunteers happy here, talk to you tomorrow'.

Summary: Commanders, you are hereby instructed to reject the melodic inducements of the Syreens. Keep a reasonable distance from the Penetrator and destroy.