The proposed study design is a single arm Phase II trial to document the feasibility of carboplatin-mirvetuximab - in patients with advanced-stage EOC. Patients with biopsy confirmed, newly diagnosed, advanced-stage serous EOC deemed appropriate for NACT will have their tumors evaluated for FRα receptor over-expression via a centralized immunohistochemical assay (IHC) and identified as appropriate for study participation if IHC staining is PS2+ in \>75% of cells (40% of all serous patients). Eligible patients will receive NACT with one cycle of carboplatin, followed by mirvetuximab + carboplatin (if FRα +) every 21 days for three cycles prior to interval cytoreductive surgery (iCRS). A total of 70 will be included in the study. Following completion of 4 cycles total of NACT and after allowing for appropriate recovery of cycle # 4, patients eligible for surgery, will undergo an iCRS. Patients will then complete 3 more cycles of mirvetuximab + carboplatin for a total of 7 intended cycles of treatment. It is up to the treating physician if they want to add bevacizumab to the last 2 cycles or use any type of maintenance therapy. The decision to add bevacizumab or use maintenance therapy does not need to be made upfront. Patients will sign a screening consent form prior to tissue biopsy. If a patient is found to be FRα negative, their treating physician can select the treatment they deem appropriate and the patient will be declared a screen failure. Patients with BRCA mutations are not excluded from this trial and are allowed to receive standard of care maintenance therapy including bevacizumab and/or PARP inhibitors.