Mrs. Mossy is the wife of Mr. Mossy, Mum's work boss. Her first appearance is in Horrid Henry and the Dinner Guests, where she eats Henry's Grisly Grub and leaves the house after the salmon burns. She also appears in "Horrid Henry Meets TJ Fizz" where Henry visits Mum's work. For some reason, she is shown to be Mum's boss in this episode, rather than Mr Mossy, who is said to be Mum's boss in "Horrid Henry and the Dinner Guests" and "Horrid Henry Changes a Nappy".

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