Resulta que el Dormammu que veréis en la pantalla está basado en capturas de movimiento realizadas por el propio Cumberbatch.
Nick Derrickson explica el razonamiento:
It’s an interesting idea, because I did fancy the idea that as this other-dimensional being he’s not moving through the Dark Dimension, with a countenance, with eyes and a face, eyes and a mouth, and a human visage – why would he? He takes that form on to communicate with Strange.
The more I thought about it the more I liked the idea, because no one understood Dormammu better than Benedict did. I also wrote that role to be a kind of ultra-inflated version of Strange.
He is an ego run amok; he is this cosmic conqueror where everything, where literally everything in the multi-verse is about him.
There’s something interesting about this confrontation of this little, tiny guy who has this power of time and this monstrous conqueror who is trapped by a clever gambit.
There’s something about that worked well, and I didn’t think anybody to interact with Benedict than he, himself.