Cyclic voltammetry (cv) and differential pulse voltammetry (dpv) studies of C120O reveal that this bis(fullerene) undergoes six sequential, one-electron reductions to form the ions [C120O](n-) where n is -1 to -6. The first two reductions of C120O occur at potentials that are close to that for the reduction of C-60 to [C-60](-) and it appears that the two electrons are added successively to each of the two fullerene cages. Similarly, the second two reductions of C120O occur at potentials that are close to the reduction potential for the conversion of [C-60](-) to [C-60](2-). Electron paramagnetic resonance spectra have been observed for both [C120O](2-) and [C120O](4-). For [C120O](2-) the EPR spectrum in o-dichlorobenzene at 77 K consists of a doublet-like feature (g = 2.0016) that is surrounded by features characteristic of a triplet state (g = 2.0030). It is concluded that for [C120O](2-) the spectrum indicates that there is significant interaction between the two electrons that have been added to the fullerene and that the species is not a diradical.