Pep was a long-running rival to Wheaties, and also the sponsor of Mutual Radio's The Adventures of Superman radio series.
In 1945, the Kellogg Company, the pioneer in cereal box prizes, inserted prizes in the form of pin-back buttons into each box of Pep Cereal.
On the back of boxes of Kellogg's Pep Cereal were cardboard cutouts of a space cadet cap, gauntlets and a ray gun, and the company made a direct tie-in with the product Kellogg's Pep: The Solar Cereal.
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