This is a Phase 2, multicenter, randomized, controlled, open-label trial of pimasertib versus dacarbazine aimed to confirm the activity of pimasertib in previously untreated subjects with N-Ras mutated locally advanced or metastatic malignant cutaneous melanoma by comparing the progression-free survival (PFS) of subjects treated with either pimasertib or dacarbazine and by getting a better understanding of the efficacy, safety, pharmacogenomics (PGx) and their relationship with pimasertib exposure.