A fuel cell stack (100) including a bipolar flow field plate (305) between a pair of fuel cell assemblies (103a, 103b) is provided. The fuel cell stack includes a pair of end plates (101, 102) and multiple fuel cell assemblies. A pair of fuel cell assemblies includes a pair of membrane electrode assemblies and the bipolar flow field plate. A first membrane electrode assembly (304) and a second membrane electrode assembly (308) have an anode face (304b, 308b) and a cathode face. The bipolar flow field plate includes a front surface (306b) with serpentine first flow channels (401) for reactant air and a second surface (306a) with serpentine second flow channels (501) for hydrogen, and multiple coolant fins (404, 405, 406, and 407) for coolant air on the front surface. The bipolar flow field plate prevents crossover of reactant air and hydrogen and avoids seam welding of two monopolar plates.