The Silent One is the appropriate nickname of a prisoner that was found drifting in space in a space craft that met with disaster. Apparently a male by the sound of things, the "Silent One" rendered various items in wall painting and drawing, including various ungulates (including a unicorn) and a peculiar map of an unnamed solar system believed home to a shining planet, that confounded the perpetually intoxicated prisoners on penal planetoid Proteus.
When Starbuck comments on Boxey's drawing, saying that a planet was off an orbit, Robber remarks about the Silent One and his drawings in the cell that Starbuck—a.k.a. Bootlegger 137—was thrown in for the duration of his stay (TOS: "The Long Patrol").
Gallery
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Bootlegger 137 awakens in a cell formerly occupied by a silent artist, whose artistic depictions include a unicorn (TOS: "The Long Patrol").
Notes
- This is yet another clue that Earth might be more than a fable of "half-drunken star voyagers," as Baltar spitefully commented in the Original Series' "Lost Planet of the Gods, Part II".