Screamin' Banshee is a character and the main antagonist in Mater and the Ghostlight.
Mater and The Ghostlight
The Screamin' Banshee lurks outside of Radiator Springs in Ornament Valley. The Banshee waits for anyone who wanders out alone in the darkness of night. He is rarely spotted but is well known through myths and legends. Nothing can make the Banshee show fear. However, he is a bit puzzled by Mater.