Kaecilius

Kaecilius is a Marvel Comics character that appears in Doctor Strange, played by Mads Mikkelsen. He is Baron Mordo's student and second in command. As such, he serves Baron Mordo loyally, helping Mordo in his attempts to kill Doctor strange and take over the world. Kaecilius is a very powerful sorcerer, highly skilled in magic and the mystical arts.

Kaecilius was created by Stan Lee and Steve Ditko