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UNCLE agents April and Mark head to the South of France, there to participate in an annual high-speed go-cart race. Their actual mission is to prevent an armored car heist planned by a group of commandoes-in-training. The climax finds the plucky April cast adrift in a hot-air balloon. Marcel Hillaire is cast as top commando Professor Pamplemousse, with Nanette Fabray in the uncharacteristically villainous role of the professor's chief aide Desiree D'Ouef. Written by Robert Hill, "The Petit Prix Affair" made its first network appearance on March 7, 1967.