Yokai's Mask

"The neurotransmitter must be in his mask. If we get the mask, he can't control the bots. Game Over."

- Hiro Hamada

Yokai's Mask is a mask worn by robotics Professor Robert Callaghan, while under a supervillain alias Yokai. It is a white mask with red markings and yellow eyes on it, giving a sinister Kabuki appearance. It is equipped with a neurotransmitter, giving Yokai the ability to control the Microbots. When the mask is removed, Yokai loses control of the Microbots.

In the final battle against Yokai, the mask is destroyed by Hiro Hamada and Baymax, thus finally causing Yokai to permanently lose control of the Microbots.