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D'Artagnan was yet another version of Alexandre Dumas' The Three Musketeers, de-emphasizing Athos, Porthos and Aramis and concentrating almost exlusively on the title character. Once he has been accepted into the Musketeers, young D'Artagnan (Orrin Johnson) dedicates himself to protecting France's Queen Anne (Dorothy Dalton) from the Machiavellian machinations of Cardinal Richelieu (Walt Whitman). To do this, he must retrieve the Queen's necklace, evidence of her tryst with the British Duke of Buckingham (Harvey Clark), from the beautiful but deadly Milady de Winter (played by movie "vamp" Louise Glaum). Many sources credit the direction of D'Artagnan to Thomas H. Ince, who only produced the film. Though somewhat prosaically produced, the film evidently made a deep impression upon Douglas Fairbanks Sr., who used D'Artagnan as a blueprint for his own 1921 version of The Three Musketeers -- thereby prompting a plagiarism lawsuit from Thomas Ince (who ultimately lost the case, due no doubt to his own predilection for "lifting" the creative ideas of others).