Indiana Jones Chronicles" explains how Indiana becomes solitary and less idealistic following his service in World War I. In "Indiana Jones and the Kingdom of the Crystal Skull", Jones is older and wiser, whereas his sidekicks Mutt and Mac are youthfully arrogant and greedy, respectively. Indiana Jones is modeled after the strong-jawed heroes of the matinée serials and pulp magazines that George Lucas and Steven Spielberg enjoyed in their childhoods (such as the Republic Pictures serials, and the Doc Savage series). Sir H. Rider Haggard's safari guide/big game hunter Allan Quatermain of "King Solomon's Mines", who dates back to 1885, is a
Indiana Jones Costume designer Deborah Nadoolman Landis noted that the inspiration for the series as well as Indiana Jones' outfit was Charlton Heston's Harry Steele in "Secret of the Incas" (1954) and called "Raiders of the Lost Ark" "almost a shot for shot" remake of the Heston film, citing that Indiana Jones was "a kinder, gentler Harry Steele": "We did watch this film together as a crew several times, and I always thought it strange that the filmmakers did not credit it later as the inspiration for the series." Many people are said to be the real-life inspiration of the Indiana Jones