In Hanna-Barbera's YOGI BEAR cartoons from 1958 and onward, Boo Boo played Yogi's sidekick. But here's one thing about Boo Boo that has been strange from the very beginning: his design seems to change from one cartoon to the next. He might have a round head in a cartoon, and then be blocky in another. He might have no forehead at all in one segment, and then he'll have a long tall forehead in the next. The point is this: early on, the folks at Hanna-Barbara were not terribly concerned about having a consistent model sheet for Boo Boo. (Nor one for Ranger Smith.)