影片从家喻户晓的安徒生童话中汲取灵感，以天真、勇敢兼具反叛精神的美人鱼爱丽儿（海莉·贝利 Halle Bailey 饰）为主角。渴望探索大海以外世界的她爱上了人类王子亚历克（乔纳·豪尔-金 Jonah Hauer-King 饰）。爱丽儿追随内心的声音，不惜违背传统，与邪恶的海底女巫乌苏拉（梅丽莎·麦卡西 Melissa McCarthy 饰）达成交易以换取体验人类生活的机会，却发现将自己和父亲都置于极度危险的境地……
演员: Halle Bailey
/ Jonah Hauer-King
/ Daveed Diggs
/ 林家珍
/ Jacob Tremblay
/ Noma Dumezweni
/ Javier Bardem
/ Melissa McCarthy
/ Art Malik
/ Jessica Alexander
/ Emily Coates
/ 林-曼努尔·米兰达
/ Jude Akuwudike
/ Russell Balogh
/ Adrian Christopher
/ Simone Ashley
/ Martina Laird
/ John Dagleish
/ Sienna King
/ Karolina Conchet
/ Craig Stein
/ David Stokes
/ Craig Stein
/ Lorena Andrea
/ Kajsa Mohammar
/ Nathalie Sorrell
/ Jodi Benson
/ Christopher Fairbank
/ Matthew Carver
/ Julz West
/ Shay Barclay
/ Arina Li
/ Leon Cooke
/ Tarik Frimpong
/ Chris George
/ Yasmin Harrison
/ Erica Stubbs
/ Kate Thompson
/ Jonathan Bishop
/ Aaron Bryan
/ Sophie Carmen-Jones
/ Jon-Scott Clark
/ Cameron Valentina
/ Austyn Farrell
/ Cecil Jee
/ Ben Hukin
/ Andrew Lyle-Pinnock
/ Chanel Mian
/ Ebony Molina
/ Ian Oswald
/ Oliver Ravelin
/ Charles Ruhrmund
/ Nicole Valverde
/ Craig Stein
/ Sasha Watson Lobo
/ Johnny White
/ Charlotte Wilmott
/ Bobby Windebank
