We investigate the electronic structure of an endohedral fullerene, Sc 3 N@C 80 , chemisorbed on Cu͑110͒-͑2 ϫ 1͒-O surface by scanning tunneling microscopy and density-functional theory. Scanning tunneling microscopy and spectroscopy identify a series of delocalized atomlike superatom molecular orbitals ͑SA-MOs͒ in the Sc 3 N@C 80 and its aggregates. By contrast to C 60 , the encapsulated Sc 3 N cluster in Sc 3 N@C 80 distorts the nearly-spherical central potential of the carbon cage, imparting an asymmetric spatial distribution to the SAMOs. When Sc 3 N@C 80 molecules form dimers and trimers, however, the strong intermolecular hybridization results in highly symmetric hybridized SAMOs with clear bonding and antibonding characteristics. The electronic-structure calculations on Sc 3 N@C 80 and its aggregates confirm the existence of SAMOs and reproduce their hybridization as observed in the experiment.