Peter Capaldi’s Doctor meets Doctor Mysterio in the 2016 Doctor Who Christmas Special.
(Yes Doctor Mysterio is the name given to the show in Mexico, but it is more likely an in joke rather than a plot point).
Does the “G” on Mysterio’s chest stand for Gallifrey? Or does it actually have an I in the design somewhere and stand for the Great Intelligence? No, I don’t see it either.