BACKGROUND: Recently, anti-ganglioside complex (GSC) antibodies were discovered among the various subtypes of Guillain-Barré syndrome. GSC is the novel glycoepitopes formed by two individual ganglioside molecules. CASE REPORT: We present a 36-year-old man with overlap Miller Fisher syndrome and acute bulbar palsy who had anti-GSC antibody that provided diagnostic robustness. CONCLUSION: Anti-GSC testing could be considered important in patients who show atypical manifestation with negative antibody reaction against each constituent ganglioside.