ThunderCats - Old Mumm-Ra ReAction 3.75" Action Figure"Wherever Evil exists, Mumm Ra lives!" His default state may be that of an emaciated mummy, but make no mistake, the shape shifting demon priest that is Mumm Ra is every bit a match for the ThunderCats. This 3. 75" articulated ThunderCats ReAction figure of Old Mumm Ra comes complete with staff accessory. Every story needs a villain get the Old Mumm Ra ReAction figure to fill that role in your ThunderCats collection.