The chapter offers a detailed discussion of the radical transformation of the Greek party system since the beginning of the economic crisis in the country in early 2010. By comparing the Greek party system before and after the onset of the crisis, the argument is put forth that the Greek party system has transformed rapidly and profoundly on most meaningful dimensions: the number of parties and the overall fragmentation of the system, the degree of electoral volatility, the type of governments, the dimensions and logic of party competition, the degree of polarization, the reintroduction of centrifugal dynamics and, generally, the degree of institutionalization of the party system. On many of these dimensions, the economic crisis arguably acted as a catalyst, pushing the Greek party system to make a sudden leap towards the same direction that other Western parties also moved, albeit in more gradual, incremental steps.