A veteran of World War I, he's the schoolteacher for most of the children in the series. He was also known by the alias "Sparrowhawk," as the leader of a local Resistance group. As the occupation progresses, he tasks the Robinsons with aiding the Resistance by distributing fliers and performing reconnaissance. Near the end of the invasion of Normandy, Mr. Herpin is injured and ultimately dies in a gunfight with German troops, buying the Robinsons time to escape