The Hounds of Tindalos were extra-dimensional predatory creatures known for being attracted to time travelers. Cryptically, the Hounds were said to inhabit the angles of time, while human inhabit the curves. This may have something to do with their method of appearance; they emerged into the human style reality through corners, first as a mist or smoke in the corner, then their physical bodies.
In one universe a Hound of Tindalos showed up in 20th century London, seeking out an angel over unspecified matters from millennia before. This disrupted Jenny Everywhere's plans for the day but a flaming sword quickly put an end to the matter. PROSE: Dog Days of Sumer)
Behind the scenes
The Hounds of Tindalos debuted in a short story of the same name by Frank Belknap Long, in the March 1929 issue of Weird Tales, and are now in the public domain.
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