Hey there. I was a kid watching film four waaaay past bed time. This was a horror movie set at like a school, maybe. Two people, guy and girl are visiting, but they’re the only normal people there, apart from the mad doctor. They stay in that place, and at some point the doctor explains how he is reanimating/brainwashing the people. It shows a ‘zombie’ doing back flips. There’s another guy looking for his girlfriend, and (spoiler alert) I think they find her dead next to a mud monster before they escape. This has driven me crazy, please help!