This chapter analyses Marlowe’s diverse use of the soliloquy across his plays. It proposes that we can go further than the usual critical commonplace of declaring the major soliloquies to be expressive of the overreaching mentality of Marlovian protagonists. Put succinctly, Marlovian soliloquy is a type of prison narrative—a voice of selfhood against extinction. It expresses the desperate thoughts of one whose life is being lived while also already effectively pre-terminated by inescapable social asphyxiation. A key philosophical and literary contribution Marlovian soliloquy makes, therefore, is to represent as vigorous those whom society casts as unviable. Their speakers attempt to theorise the relationship between their agentive selves and the contexts that make their selves simultaneously possible and (ultimately) impossible.