Though aiding the ThunderCats in fighting off Mumm - Ra 's army , Vultaire betrays his fellow Avistans .
Though aiding the ThunderCats in fighting off Mumm - Ra 's army , Vultaire aligns himself with Mumm - Ra upon witnessing his power firsthand .
Though aiding the ThunderCats in fighting off Mumm - Ra 's army , Vultaire betrays his fellow Avistans and aligns himself with Mumm - Ra upon witnessing his power firsthand .