Case History: The gang arrive at Wolf's End Lodge, a spooky ski resort, for some winter recreation. When they check in, the chuckling lodge owner, Mr. Greenway, warns them to keep their doors and window locked, or the "Snow Ghost" will get them and turn them into ghosts. And no sooner does he leave than the Snow Ghost itself shows up outside the window. They follow its enormous tracks on snowmobiles and spot it on a cliff opposite. To their astonishment, it soars into the air and over their heads, gliding into the woods beyond.

They follow it and find a cave furnished with Tibetan objects. Ringing a gong, they summon the cave's occupant, Fu-lan Chi, a refugee from the Himalayas who tells them the story of the Snow Ghost. He had encountered the Yeti in Asia and barely eluded it when the creature attacked him and tumbled to its death in a crevasse. But his escape was shortlived, for the Yeti's ghost returned to seek its revenge on him and even followed him to the US.

The gang don't know what to make of Fu-lan Chi's story, but after leaving they discover a new set of Snow Ghost tracks (which are covered in sawdust) and follow them to a deserted sawmill. They split up to investigate; Shaggy disappears down a trap door, and the Snow Ghost grabs Velma, chains her to a log, and sends her toward a buzzsaw. Scooby pulls her off the conveyor belt and slides down (log and all) into the lake. The Snow Ghost sends another log (carrying dynamite) after them, but they escape. Scooby and Velma hook up with Fred and Daphne again, and all are alarmed when Shaggy, pale and moaning like a phantom, materializes. But he returns to his normal color when he falls into a pool; Velma theorizes that he was sprayed with a white substance to make him look like a ghost. Fred's realization that, maybe, the Snow Ghost isn't a phantom either, is interrupted when the Snow Ghost appears and chases them. Fred, Daphne and Velma duck behind a pile of logs. After the Snow Ghost leaves, Daphne discovers a hollow log that is filled with diamonds and jewelry.

The Snow Ghost, gliding upright a few inches above the snow, chases Shaggy and Scooby, who try to escape in a snowmobile, only to wind up frozen like popsicles when they run into thin ice. They are chipped out by the rest of the gang, but their accident gives Fred an idea: They'll lure the Snow Ghost to a place where they can quick-freeze it by dumping a tub of water on it. But the Snow Ghost appears behind Scooby, and the water freezes too quickly to be used on it. Scooby and the Ghost fight but are knocked down when Shaggy catapults an enormous snowball at them. They cannonade down the slope, catching up the rest of the gang before crashing into a cliff face. The Snow Ghost is unmasked as Mr. Greenway: He and his partner Mr. Leech used Fu-lan Chi's story of the Snow Ghost as a cover for their smuggling operation; as the Snow Ghost, Greenway "flew" by using transparent plastic skis.

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