Hideous! (1997)

Dr. Lorca, an eccentric collector of biological oddities – has just “acquired” his greatest specimen: a horrible mutant born of toxic sewage, but the creature’s rightful owner wants it back. The collector’s clash is cut short though, as the sickening specimen comes to life, re-animating an angry, oozing little army of ferocious freaks

• castle
• monster
• mutant