Sanctuary S4, E3

Stem cells, gene therapy, transplants, cloning; The very meaning of the word "humanity" changes daily in the modern world. But there is a darker side to the evolution of mankind, a truth only a few brave souls are willing to face: There are monsters loose in the world. And they are the key to the future of our race.

Cast:Amanda Tapping , Robin Dunne , Christopher Heyerdahl , Ryan Robbins , Agam Darshi , Emilie Ullerup , Jonathon Young , Robert Lawrenson , Pascale Hutton , Ian Tracey , Lynda Boyd , Shekhar Paleja , Chuck Campbell , Peter Wingfield , Jim Byrnes , Christine Chatelain , Paul McGillion , Brian Markinson