Siren The " Siren " was a virtual doctor from a spaceship who took pirate s from the " Fancy " through a dimensional rift to treat them . Biography . The Siren worked on an unnamed spaceship in another dimension . It accidentally became trapped in the same space as the " Fancy " in 1699 . Any reflective surface acted as a portal to the other dimension . The crew was wiped out by a disease from Earth , leaving her with no patients . With nothing to do , she became aware of the " Fancy " s presence , and sensed any crew member who was wounded in the slightest way ( for example , a small cut ) . She then took tissue samples of the wounded sailor , leaving a black spot so she could return and take the sailor to the sick bay to care for . However , even though she could keep her patients alive with life support , she didn ' t know how to cure their ailments as they did not come from the planet she was programmed on . She continued to do so after the Eleventh Doctor , Rory Williams and Amy Pond arrived , despite their attempts to ward her off . During a storm , she took Captain Henry Avery ' s son , Toby . When Rory was knocked off the ship and began to drown , the Doctor exposed a reflective surface so that she could save him . The Doctor , Amy and Captain Avery all allowed themselves to be taken by the Siren to see where they would go . When they found Rory and the crew , Amy showed the Siren her wedding ring . The Siren gave her consent to care for Rory . Captain Avery knew that his son couldn ' t be saved , so he took over the space ship with his crew , allowing the Siren to care for them . ( TV : " The Curse of the Black Spot " ) Personality . The Siren appeared to possess limited intelligence . Incapable of communication by any language and being unable to detect the severity of an injury ( she would take those who had a simple cut ) , the Siren refused to let anyone help her patients unless they were connected in some way , such as marriage . She required them to " sign a consent form " by placing a hand in a glowing ring that appeared on her palm , confirming they would take full responsibility for the patient . She was fanatic about keeping germs out of the sick bay , threatening to incinerate the Doctor when he sneezed . ( TV : " The Curse of the Black Spot " ) Abilities . The Siren could look like the species she treated ; when attempting to treat human s , she looked like a green woman clothed in a gown . When interfered with or faced with contaminated material , she would become red and angry . When someone was injured , she took a tissue sample from their hand , leaving a black spot , which would be removed as soon as the patient was sent to the sick bay . The Siren ' s singing acted as an anaesthetic . She used her song to lure individuals to her , although it only affected those from whom she had taken a tissue sample . On touching her , people would be teleport ed to a sick bay . Her screams were also capable of catapulting people away , as Amy was thrown backwards when she protected Rory from being taken . She used this to keep herself safe from contaminated materials or on those between her and her patients . The Siren could also produce fire to sterilise infected material . She almost incinerated the Doctor . ( TV : " The Curse of the Black Spot " )