Herman Mueller was a minor character in the movie Indiana Jones and the Last Crusade.
Herman Mueller, Jr. was born in 1899 to the wealthy treasure hunter, Herman Mueller, Senior.
The junior Mueller was a Boy Scout and in 1912, Herman and his friend Indiana Jones went on a Boy Scout equestrian camping trip together in Utah. After separating from the rest of the troop, Herman and Indy explored a cave in a canyon, where they discovered Fedora and his crew digging up the Cross of Coronado. Indy sent Herman back to find Mr. Havelock and inform the Sheriff that there were looters in the caves. After being scared by a snake, Herman took off on his mission.
Shortly after Indy returned to his house, Herman showed up, announcing his arrival with his bugle. He had succeeded in bringing the sheriff, but the lawman took Fedora's word for it that the relic was stolen from him and his gang. The Cross was returned to them and presented to Panama Hat, who was seen as the rightful owner.
A week later, Herman accompanied Indy and Helen Margaret Seymour to Klondike, Yukon, in search of a treasure of gold