An airfoil comprising: an airfoil section having an airfoil wall defining a leading end, a trailing end, and first and second sides (68c, 68d) joining the leading end and the trailing end, the first and second sides (68c, 68d) spanning in a longitudinal direction between first and second ends (68e, 68f), the airfoil wall circumscribing an internal core cavity; and characterized by first and second platforms (62, 64) attached, respectively, with the first and second ends (68e, 68f); and a cooling passage circuit extending at least in the first platform and the airfoil section, the cooling passage circuit including: a first plenum in the first platform, wherein the first plenum includes an inlet adjacent the first side at which cooling air initially enters the cooling passage circuit, and the first plenum wraps around the internal core cavity extending adjacent to each of the first side, the trailing end, and the second side of the airfoil wall; a skin core passage embedded in the first side of the airfoil wall and extending longitudinally; a main supply passage longitudinally spaced from the internal core cavity extending under the internal core cavity and connecting an aft portion of the first plenum with the skin core passage to provide a main supply of the cooling air into the skin core passage from the first plenum; and a resupply passage connecting a forward lobe of the first plenum with the skin core passage such that a remainder of the cooling air that does not flow to the aft portion flows forward through the forward lobe to the resupply passage and into the skin core passage. an airfoil section having an airfoil wall defining a leading end, a trailing end, and first and second sides (68c, 68d) joining the leading end and the trailing end, the first and second sides (68c, 68d) spanning in a longitudinal direction between first and second ends (68e, 68f), the airfoil wall circumscribing an internal core cavity; and characterized by first and second platforms (62, 64) attached, respectively, with the first and second ends (68e, 68f); and a cooling passage circuit extending at least in the first platform and the airfoil section, the cooling passage circuit including: a first plenum in the first platform, wherein the first plenum includes an inlet adjacent the first side at which cooling air initially enters the cooling passage circuit, and the first plenum wraps around the internal core cavity extending adjacent to each of the first side, the trailing end, and the second side of the airfoil wall; a skin core passage embedded in the first side of the airfoil wall and extending longitudinally; a main supply passage longitudinally spaced from the internal core cavity extending under the internal core cavity and connecting an aft portion of the first plenum with the skin core passage to provide a main supply of the cooling air into the skin core passage from the first plenum; and a resupply passage connecting a forward lobe of the first plenum with the skin core passage such that a remainder of the cooling air that does not flow to the aft portion flows forward through the forward lobe to the resupply passage and into the skin core passage. a first plenum in the first platform, wherein the first plenum includes an inlet adjacent the first side at which cooling air initially enters the cooling passage circuit, and the first plenum wraps around the internal core cavity extending adjacent to each of the first side, the trailing end, and the second side of the airfoil wall; a skin core passage embedded in the first side of the airfoil wall and extending longitudinally; a main supply passage longitudinally spaced from the internal core cavity extending under the internal core cavity and connecting an aft portion of the first plenum with the skin core passage to provide a main supply of the cooling air into the skin core passage from the first plenum; and a resupply passage connecting a forward lobe of the first plenum with the skin core passage such that a remainder of the cooling air that does not flow to the aft portion flows forward through the forward lobe to the resupply passage and into the skin core passage.