"Kush" is the fifth episode of the first season of Sanctuary, and the fifth episode overall in the series.
Returning with an Abnormal captured in the Himalayas, Magnus and Will are stranded from civilization and aid after their plane goes down in a desolate mountain range. While anxiously waiting for a rescue team, the surviving passengers begin to fall victim to vicious and deadly attacks throughout the night. It becomes chillingly apparent that surviving the cold is the least of their worries and no one, not even Magnus and Will, is above suspicion.
Dr. Helen Magnus dreams of a night in late 19th Century London, when she and then-lover John Druitt went out celebrating. Druitt eventually proposed to her in a carriage, much to her surprise. In that moment, Dr. Magnus wakes up and finds herself and Dr. Will Zimmerman along with some other people in a plane that has crashed on a snowy mountainside somewhere in the Himalayas.
Geography: The top of Tirich Mir is over 25,000 feet above sea level, and base camps for climbing Tirich Mir are usually at about 15,000 feet. If the crash site was between these two then our main characters were at least three miles up, where walking across the room is serious aerobic exercise.
Reference: In a frozen wasteland an isolated group must identify a deadly creature capable of mimicking any one of the group; the only test for the monster is the innate behavior of its blood. That is the synopsis of this episode and of the 1938 John W. Campbell novella 'Who Goes There?'. 'Who Goes There' is also the source for the movie 'The Thing'.