Season: 4

Original Airdate: October 19, 2007

Writer(s): Robert C. Cooper

Director(s): Robert C. Cooper

Guest Stars
Jewel Staite as Dr. Jennifer Keller
Claire Rankin as Dr. Kate Heightmeyer
Kavan Smith as Maj. Lorne
David Nykl as Dr. Radek Zelenka
Linda Ko as Med-Tech
Yee Jee Tso as Technician

Synopsis: Sheppard encounters a psychopathic crystalline entity that takes on his likeness in his team’s nightmares.

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