"There's no denying that Leviathan's story has a hodge-podge quality to it, akin to the film's own monster that becomes an amalgam of its victims and it's pretty evident that Cosmatos' film shares a bit of "DNA" with several of its sci-fi counterparts as well. But what makes screenwriters David Peoples and Jeb Stuart's story stand out is that the duo cleverly injects a few surprises and innovative twists on the sea beast subgenre, resulting in a film that's a lot of fun and a near-perfect homage to the B movies of yesteryear." - Heather Wixson, Daily Dead