the snow ghost
The Snow Ghost its a ghost which appearance in the episode That's Snow Ghost from Scooby-Doo, Where Are You?
History
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. Mr. Greenway took advantage of this wild story and became the ghost of that yeti,
the snow ghost. The Snow Ghost would scare people away from an abandoned lumber mill where Mr. Leech brought and smuggled stolen jewels.
Their plan was foiled when Mystery Inc. came to Greenway's Wolf's End Lodge, and investigated this mysterious ghost.
How he was caught
The original plan was to pour water all over him than have it freeze him into place. Unfortunately, the water froze before it could reach him, then the ghost grabbed Scooby Doo and tried to throw him off the cliff. Shaggy then threw a snowball at the snow ghost, and he fell back and started to roll down the hill. A giant snowball was created, engulfing the entire gang and the ghost. It rolled until it hit a large rock. Then, the snow ghost's mask fell off, revealing Mr. Greenway.
References
The Scooby Doo Case Files <scoobyfiles.toonzone.net/casefiles/seasonone/tsg.html>