In seventeenth-century France, young D'Artagnan initially quarrels with, then befriends, three musketeers and joins them in trying to outwit the enemies of the king and queen.

In 17th Century Paris young, naïve, and energetic D’Artagnan leaves home to seek his fortune as a swordsman. He soon makes friends with the three musketeers: world-weary Athos, comically arrogant Porthos and chivalric Aramis. Their enemy is aristocratic schemer Cardinal Richelieu, who plots to prove the infidelity of the Queen to King Louis XIII to increase his own power.

D’Artagnan arrives in Paris trying to find his attackers after being left for dead, which leads him to a real war where the future of France is at stake. He aligns himself with Athos, Porthos, and Aramis, three musketeers of the King.