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Lady Agatha (also referred to as Lady Knocknee) appeared in two Mysterious Theater segments on Sesame Street, first losing her cat and then having her toast and roast stolen by Vincent Twice (who flat-out refused to give them back). She called Sherlock Hemlock and his dog Watson to solve the cases. When looking for the cat, Hemlock, knowing it was under something ending in "at," thought at first that it was Lady Agatha's lovely new hat, and told Watson to find out. As a result Watson ended up ruining Agatha's hat.