A repeat unit for a fuel cell stack, the repeat unit having: a conductive interconnect plate; an electrolyte-supported fuel cell, wherein a dense sealing perimeter extends around the entire perimeter of the fuel cell; a cathode gasket adjacent the cathode side of the fuel cell; and an anode gasket adjacent the anode side of the fuel cell. First and second air manifolding ports, and first and second fuel manifolding ports are provided in each of the interconnect plate, dense sealing perimeter of the fuel cell, cathode gasket and anode gasket. An SOFC stack having an aligned stack of a plurality of repeat units is also provided, as well as an SOFC stack configured for cascade fuel flow.