“Toxic Shark” (** out of four) was a trifling shark thriller about a group of annoying young singles (Kabby Borders, Christina Masterson, Bryce Durfee and others) who go to a tropical retreat which is invaded by a poisonous shark whose victims soon turn into zombies! Sounds a lot more fun than it plays out although it remains watchable. The shark scenes deliver the goods but in between- the movie is often dumb and dull. When you’re rooting for the shark to devour and kill his victims, that should be the first sign that something is wrong.