Julia

Julia is Sam's stand-in, so that the Las Serpientes Que Caminan think that she and Lara are home (Lara's stand-in being Lily), while they are actually searching for their friend Angus "Grim" Grimaldi, but find his twin brother Cuddy Grimaldi instead. She is also suggested to be part of Sam's acting class.

Personality
Julia seems like an ordinary girl, who just looks suspiciously like Sam.

Trivia

 * It is unknown if Julia and Lily are actually friends, like Lara and Sam themselves.