Mr. Peterson (Trading Chases)

Mr. Peterson is a character in "Trading Chases", an episode of the Be Cool, Scooby-Doo! animated TV series.

Biography
He was the 3rd Grade teacher of Jeff. Mr. Peterson tried to dissuade him in believing that he could climb Mount Everest's "invisible twin" called Mount Flappy McFlunken, which Jeff never forgot and held a grudge against him into his adulthood.