Sentrycroft was the estate of Simon Harper. History From Sentrycroft, Harper operated the real-life Sentries, Corey, Dempsey and Burfid. He also kept a large hall of collectibles from the series. It was destroyed after Harper was exposed as a fraud. Sighting Batman Beyond "Sentries of the Last Cosmos" Retrieved from "https://dcau.fandom.com/wiki/Sentrycroft?oldid=90833" Categories: Headquarters A to Z Community content is available under CC-BY-SA unless otherwise noted.