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Professor Robert Callaghan (also known as Yokai) is the main villain of Disney's 2014 animated feature film, Big Hero 6. He was the head of the San Fransokyo Institute of Technology and mentor of Tadashi Hamada. However, after a tragic incident, he became the villainous Yokai, determined to extract revenge on those who wronged him, especially his son-in-law Tomohiko Kazami. He is based on Dr. Tomoe from Sailor Moon series. He is the estrange father of Abigail Callaghan

He is voiced by James Cromwell.


Tall figure with a black coat, black gloves, leg wraps, black, ankle-length ninja boots, and a white-and-red kabuki mask.


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