Mr Thursday was the brother of Edmund. After Edmund was afflicted by the "crimson horror" in Sweetville, in 1893, Mr Thursday took a picture of Edmund's face, which showed an optogram of the Eleventh Doctor in his eye. Mr Thursday showed this image to Madame Vastra and Jenny Flint. Vastra lifted her veil. The sight of her lizard face caused Mr Thursday to faint.
Later, when he checked on how they were doing, Mr Thursday fainted again when the Sontaran butler, Strax, answered the door. Later, when he saw the Doctor's TARDIS dematerialise, he fainted again. (TV: The Crimson Horror)