It is through her that Strange finds the secret world of magic and other dimensions. He gets to know about the mystical organization that defends earth against the dark powers that threaten reality. Training on the magical arts, Strange has to deal with Kaecilius (played by Mads Mikkelsen), the one who is a former student who wants to cause disorder by joining the Earth to the Dark Dimension of Dormammu.
This movie ends with an ingenious and unorthodox fight where Strange is not able to fight with his hyperpower but with his cleverness to overcome Dormammu that he is worthy and is able to protect the earth.