Frankenstein; or, The Modern Prometheus by Mary Shelley and the characters within, tell a prominent story of the posthuman condition in a society where humanist thought is the only conception of subjectivity. The use of not only posthuman studies, but more specifically studies including subjectivity was needed, in order to analyse the relationship between the humanist and the posthuman subjects. Theories of posthuman subjectivity and subjectivity by Rosi Braidotti and Michel Foucault were used in order to examine the posthuman condition of “Frankenstein’s monster” and the role of humanist vs. posthuman subjectivity between Victor Frankenstein and the monster. The tension between Victor and the monster was analysed in order to investigate the monster’s struggle at acquiring subjectivity in a posthuman state, which revealed why it is impossible for the humanist and posthuman subject to peacefully coexist.