AviciousalligatornamedRamon,whowasflushedintothecitysewerasababy,survivestobecomea32-foot-longmenacewhodevoursanimalsandpeoplealike.Ramon'ssohugebecauseofthesteadydietofdeadpets-treatedwithgrowthhormones-thathe'sfedonfor12years.Nowthetremendousbruteisangryandlookingforrevenge.OnlydetectiveDavidMadisonknowsofRamon'sexistence,anditishistasktoprovetotherestofthecitythatatropicalbeastlivesintheirmidst.VeteranscreenwriterSayles'scriptfindstheperfectblendofcomedyandhorror,makingthisanentertainingrompthroughthesewersofChicago在视听创作上，影片避免戏剧化手法。数字技术让历史影像重现光彩，全彩修复增强细节表现，画面技术拓展观看视角。技术运用保持适度，整体色彩偏向低调。整体表现注重价值传达。色彩选择体现审慎态度，声音创作追求自然效果。