The animated character who later used the slogan "The one and only cereal that comes in the shape of animals" to promote Crispy Critters was originally created to promote which cereal?
Crispy Critters: Crispy Critters was a breakfast cereal manufactured by Post Cereal starting in 1963. Crispy Critters:  The sweetened cereal, made of oats, consisted of animal-shaped pieces akin to animal crackers. Television commercials featured a cartoon lion, Linus the Lionhearted, voiced by Sheldon Leonard, with the slogan "The one and only cereal that comes in the shape of animals," sung to the tune of "Trepak" from Tchaikovsky's "The Nutcracker" ballet. Crispy Critters:  The next year, Linus was spun off into a Saturday-morning cartoon show, which ran for two years on the CBS network, then reran on the ABC network for three more until 1969. Linus the Lionhearted:  At first, Linus was the spokesman for the short-lived Post cereal "Heart of Oats" (a Cheerios imitation).
Heart of Oats