On board a 17th century pirate ship sailing the ocean waves, a crew under the command of one Captain Avery are being picked off one by one by a ghostly apparition. They believe it to be a legendary Siren, a beautiful and mesmerizing demon who lures men to their death with its haunting Siren song. She marks her prey before retrieving them with a black spot on their hand, a mark that means certain death. As they are becalmed and stuck in the ocean, all seems lost for the dwindling pirate crew… until three stowaways are discovered with a mysterious blue crate.
Watch It Here : Doctor Who Season 6 Episode 4
