Ameloblastic carcinoma is a malignant lesion with characteristic histological features and behaviour. In this case report we presented a case of massive Ameloblastic Carcinoma occurring in the mandible of a 34year old Nigerian female. Its typical clinical features, aggressive behaviour and differential diagnosis is discussed in detail. We treated the patient with radical resection and reconstruction with composite/double flaps using free fibula & anterolateral thigh flap as a single stage procedure. Reconstruction using double flap is rare but need of hour of treating huge defects, makes our treatment plan unique.