Inclusion Criteria:

          -  Has histologically or cytologically confirmed melanoma

          -  Has clinically detectable and resectable Stage IIIB or IIIC or IIID melanoma amenable
             to surgery

          -  Has been untreated for Stage IIIB, IIIC or IIID melanoma

               -  surgical resection of primary melanoma is allowed

               -  prior radiotherapy to the primary melanoma is allowed

          -  Has provided a baseline tumor biopsy

          -  Male participants who receive V937 are abstinent from heterosexual intercourse or
             agree to use contraception during the intervention period and for at least 120 days
             after the last dose of V937

          -  Female participants are not pregnant or breastfeeding and are either not a woman of
             child-bearing potential (WOCBP) OR use a contraceptive method that is highly effective
             or are abstinent from heterosexual intercourse during the intervention period and for
             at least 120 days after the last dose of pembrolizumab, vibostolimab, V937, whichever
             occurs last

          -  Has adequate organ function

          -  Has resolution of toxic effect(s) of the most recent prior therapy to Grade 1 or less
             (except alopecia)

        Exclusion Criteria:

          -  Has a diagnosis of immunodeficiency or is receiving immunosuppressive therapy within 7
             days before the first dose of study intervention

          -  Has a known additional malignancy that is progressing or requires active treatment
             within the past 2 years

          -  Has known central nervous system (CNS) metastases and/or carcinomatous meningitis

          -  Has ocular or mucosal melanoma

          -  Has known hypersensitivity including previous clinically significant hypersensitivity
             reaction to treatment with another monoclonal antibody (mAb)

          -  Has an active autoimmune disease that has required systemic treatment in the past 2
             years

          -  Has an active infection requiring systemic therapy

          -  Has known history of human immunodeficiency virus (HIV)

          -  Has known history of hepatitis B

          -  Has a history of (noninfectious) pneumonitis

          -  Has a history of active tuberculosis (TB)

          -  Has received prior systemic anticancer therapy within 4 weeks prior to randomization

          -  Has received prior radiotherapy within 2 weeks of first dose of study intervention

          -  Has had major surgery <3 weeks prior to first dose of study intervention

          -  Has received a live vaccine within 30 days before the first dose of study intervention

          -  Has participated in a study of an investigational agent within 4 weeks prior to the
             first dose of study intervention

          -  Has had an allogeneic tissue/solid organ transplant

          -  Has only mucosal lesions

          -  Is not naïve to Talimogene laherparepvec (TVEC) and other oncolytic viruses