Abstract We discuss the finite temperature excitation spectrum in a dense charged Bose-condensed gas (CBG), which is of interest in connection with the new high transition temperature oxide superconductors. The free Bose gas (RPA), and the 1-loop approximations for the proper, irreducible quantities are examined. We point out that while the plasmon excitation frequency is essentially temperature-independent in a dense CBG, its weight as a pole of the single particle Green functions decreases with the condensate fraction n 0 ( T ). At the same time, as the temperature increases, the single particle spectral weight shifts to strongly damped single-particle modes, which become free particles at T c . Thus we conclude that, in contrast to a dilute weakly interacting Bose gas with short-range interactions, the excitation spectrum of a CBG is more analogous to that in superfluid 4 He.