We all know the recipe by now, right? Take a tropical or otherwise beachfront location, stir in some bikini babes and beefy bros, then add a CGI monster, preferably some combination of existing things -- a piranha and an anaconda, say, or a shark and a tornado.
The title creature of Mark L. Lester's Poseidon Rex, unwittingly released off the coast of scenic Belize by manly cave-explorer Jackson Slate (Brian Krause), is an amphibious Tyrannosaurus rex with fins and what look like water wings on its already adorable little arms. Poseidon Rex is a rarity in this monster-movie cycle in that it's not produced by Roger Corman or The Asylum, and unlike genre-standard Sharknado, Poseidon Rex doesn't grind to a halt when the monster isn't onscreen. That the movie maintains some momentum during exposition and what passes for character development is thanks to director Lester, a journeyman who's been cranking out B-movies since the early 1970s, including Truck Stop Women, Commando, and the stone-cold classic Class of 1984.
While Poseidon Rex is nowhere near as visceral (or fun) as those pictures, at least it feels like it was directed by someone who knows where to place the camera, and that's more than you can say for most modern low-budget monster flicks.