Velma is the form the Mongolian death worm takes.
It is unclear if the worm is a shapeshifter, if Velma is an illusion, or if Velma is a body the worm inhabits. Velma's behavior is dictated by the presence or absence of her portable TV, which is the key to unleashing her devastating attacks. The possessor of the TV is completely safe from Velma, although what would happen if the TV were lost or broken is not specified. Potential purchasers, however, are warned never to let it happen.