Silver is the last of the Himalayan Yeti who appears in Ninja Turtles: The Next Mutation.
History
Instead of spending his time on top of a mountain, he decided to make the most of it by going into crime. His gang of humans have the collective IQ of a peanut and they think he's the smartest boss around. Silver is always looking for a way to get more money then he already has, usually by stealing it from somewhere. He also is highly offended by monkey jokes, even though he likes to eat bananas.