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Treebark is a robot facsimile of a Cylon Centurion created by Spectre, an ambulatory cybernetic sentience that assumes command of the garrison on Antila after ever reptilian Cylon dies as a result of that planet's diseases.
As with Spectre's other creations, Treetop is named after an attribute of the planet Antila. After Spectre leaves the planet with another Centurion, Hilltop tells Treebark that they will surrender to the humans "with honor", a concept that Hilltop then programs into the facsimile (The Young Warriors).