Pat fights a bout of pneumonia as the cold weather takes hold.

Skip attempts to return to civilization for medication to treat Pat's pneumonia on skis and is caught in an avalanche.

Toby struggles to fight them off with a rifle as they methodically tear their way into the house and finally confronts Scarface in an explosive climax.

The Robinsons' courage and the will to survive, along with breathtaking surroundings, help keep the family happy in their mountain home.

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