Forgeti

The Forgeti was a creature which appeared in the Ben 10 animated series episode Forgeti.

Description
Standing twice the height of a fully-grown man, the Forgeti was an enormous humanoid being resembling Sasquatch or the Yeti. It was the protector of the forest and had the ability to emit a gas which caused people to fall unconscious and lose part of their short-term memory, forgetting what they had been doing and removing any recollection of the creature from their minds.

History
When Ben, Gwen and Grandpa Max were being held at the mercy of Dr. Animo and his mutant henchman Gil in their forest cave-lair, the Forgeti appeared and used its gas to cause everyone present to lose consciousness. When they awoke, the dastardly doctor and his pet were all tied up awaiting the arrival of the authorities.

Trivia

 * The Forgeti's name is a portmanteau of the words forget and Yeti.