Mr. Greenway
The Snow Ghost was the disguise of Mr. Greenway. He wanted to scare people away from his smuggling operation so he dressed up as the Snow Ghost after hearing that Tibetan monk Fu Lan Chi thought that the Yeti's ghost was out to get him.
Physical appearance
The Snow Ghost, while not exeptionally tall, was a large creature that looked exactly like it did in life. It had long white fur, claws, large footprints, orange eyes, and horns that curve in the place of eyebrows and point above his head
Personality
As the Snow Ghost, Mr. Greenway was willing to kill to protect his smuggling operation, this was demonstrated when he attempted to saw Velma Dinkley in half, threw a bundle of dynamite at her Scooby-Doo and Shaggy Rogers, and tried to hurl the former off a cliff.
Powers and abilities
The Snow Ghost was able to 'fly' because of transparent skis that were hard to spot at night. The ghost also seemed to be extremely powerful, which would be explained by the large stature of Mr. Greenway. The legend was that the ghost could transform others into ghosts, which was really just covering them in flour.
History
Early 'life'
According to Fu Lan Chi, while the ghost was still alive, it was a yeti living in Asia. Fu Lan Chi was attacked by this monster, but he escaped and the yeti fell to its death. Some time later it returned to get him.
Scooby-Doo, Where Are You!
Season one
Mr. Greenway took advantage of this wild story and became the ghost of that yeti, the Snow Ghost, who would then scare people away from the abandoned lumber mill where Mr. Leech brought and smuggled stolen jewels. Their plan was foiled when Mystery Inc. came to Greenway's lodge, and investigated this mysterious ghost.
The original plan was to pour water all over the Snow Ghost, freezing him solid to enable capture. Unfortunately, the water froze before it could reach him, then the ghost grabbed Scooby and tried to throw him off the cliff. Shaggy then threw a snowball at the Snow Ghost, knocking him over. Whereupon he started to roll downhill creating a giant snowball which engulfed the entire gang too. The snow ball rolled until it hit a large rock, then, the Snow Ghost's mask fell off revealing Greenway.