What the Light Hides - Ainhoa returns unexpectedly to the Estrella Polar, but she is with a stranger and not Ulises. The stranger indicates that the lighthouse represents extreme danger, but since he only speaks his native Asian language, the crew are uncertain of what his warning means. Meanwhile, members of the crew realize that none of them applied for the expedition raising questions of how they were selected. Ulises reveals part of his past through flashbacks as his selection by Project Alexandria is explored.
—FourByFour