Ari - Helena Bonham Carter
It's not a Tim Burton film is Helena Bonham Carter isn't in it, even though she's extremely unrecognizable. Carter had to sit for hours while she was suited up, and described the costume as "unbearably hot" and "very unpleasant." Much of the Ari suit was made of rubber, including her hands and ears.
Kaecilius - Mads Mikkelsen
Mads Mikkelsen is popular for his role as Hannibal Lecter in the Hannibal series, but he's also a famed character in Doctor Strange. He played Kaecilius, who is the main enemy against Doctor Strange himself. He starred alongside Benedict Cumberbatch.