Edmund was the brother of Mr Thursday and the husband of Effie. In 1893, he and Effie entered Sweetville to search for the Eleventh Doctor and Clara. He told Effie to call the police if he didn't return in an hour. According to the Doctor, he either fell or was pushed into a vat of the red leech poison and he turned crimson himself. He ran into the room the Doctor was kept in before falling over and dying from the poison. Due to the effects of the poison, an optogram of the Doctor appeared in his eyes at the point of his death. (TV: The Crimson Horror)

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