The Shrieker is a fictional species in the Tremors series of films. It appeared in Tremors 2: Aftershocks, Tremors 3: Back to Perfection and several episodes of Tremors: The Series. It is the second life cycle of the Graboids featured in the series; the Graboid being the first and the Ass Blaster being the next and final. The Shrieker can be seen as a kind of pupa without the immobility, or a nymph even though a nymph would be the young beginning stages for animals (insects) with incomplete metamorphosis, the Shrieker being the middle teen stage. And the Graboid species clearly shows a complete metamorphosis.