Bellow

Boris Belinsky, better known as "Bellow", is an Olympic gymnastics coach. In his youth, he traveled many kilometers through snow to get to the gym. He has currently coached a total of 9 girls to win Olympic gold medals. He also made an audio book about gymnastics, The Tiger of the Tundra, which Marina gives to Prunella "for inspiration."

He makes a cameo in Slink's imagination in "Slink's Special Talent"