Stardates: 5483.7--Investigating a sector of space where starships have disappeared every 27 years, the U.S.S. Enterprise finds a race of beautiful women who survive by drawing the energy from the male members of the ships that they have lured to their planet.
original airdate--September 29,1973
Starships: U.S.S. Enterprise NCC-1701
Goofs: As Spock lies in Sick Bay giving instructions to Nurse Chapel, the other female crew member changes from African-American to Caucasian.
Trivia: The title of this episode is a reference to the Legend of the Lorelei, which is an old German tale of a beautiful woman who lured sailors to the Rhine causing them to crash on the rocks - analogous to the sirens of Ancient Greek mythology.