The Curse of the Black Spot by a Siren-like creature who marks people with black spots on their palms after they are injured and appears to disintegrate them with her touch after putting them in a trance. Rory Williams receives a cut during a tussle with the pirates, and finds a black spot on his hand, but is prevented from succumbing to the song of the Siren by Amy Pond and the Doctor. Surmising the Siren is using water as a portal, the Doctor instructs the crew to seek refuge in the ship's dry magazine. There, they find Toby Avery, the son of the ship's captain
Russian pyramid pockets). However, gameplay is similar to that of English billiards and Snooker; it is played with two white cueballs, one for each player, two red balls and a yellow ball, the "kaisa". A player must pocket a nominated ball, scoring points. Extra points are given from hitting other balls in addition to the target ball. All balls are spotted and the game is played to 60 points. Kaisa is often regarded as the most difficult game of pocket billiards in the world. American-style pocket billiards (pool) balls have been adapted for use on Russian billiards tables, for playing eight-ball, nine-ball