Best-fitting templates using the method of Cullen et al. (2019) to determine the stellar metallicities from stacked spectra (shown in black, with errors in grey) of He II emitters (top) and non-emitters (bottom). The metallicities derived for both classes of objects are highly comparable, at roughly 10% that of solar metallicity. The inferred UV slope and fitted absorption features are comparable in both stacks, however the stack of He II emitters has stronger emission lines compared to the stack of non-He II emitters.