The Yeti is a Chinese super-hero named Hu Wei and a member of the Great Ten. He is a metahuman with the ability to turn into a gigantic powerful beast. This caused problems when he lost his humanity and began wandering the Himalayas. Hu Wei was killed by Black Adam during World War III.
Yeti was created by Geoff Johns, Grant Morrison, Greg Rucka, Mark Waid, Keith Giffen, and Pat Olliffe, first appearing in 52 Week #32 (2006).