Percy discovers that the Greek gods have been walking among us and reproducing with humans for eons and that he is the demigod son of Poseidon (Kevin McKidd). Apparently, Poseidon’s brother Zeus (Sean Bean) has had his lightning bolt stolen, and if it isn’t returned Zeus will declare war with his other brother Hades (Steve Coogan) against all the gods. The assumption is that Percy took the bolt. But the boy doesn’t know where it is. Has anyone thought to check Harry Potter’s forehead?
It’s not long until Percy’s mother (Catherine Keener) has sent him to Camp Half-Blood, which is run by his mythology teacher, who sheds his wheelchair and turns into half-horse, half-Pierce Brosnan. Among other things, Percy has to collect a set of pearls and arrive at the gates of hell to rescue his mother, which he does accompanied by his two friends, Ron and Hermi - excuse me. They’re a satyr named Grover (Brandon T. Jackson) and Athena’s demigod daughter Annabeth (Alexandra Daddario), and as a trio, all they seem to do is slay beasts, which will please some young moviegoers to no end.
The film is based on Rick Riordan’s hit Percy Jackson books (the first appeared in 2005). Riordan was a schoolteacher whose career as a popular writer began as a mystery novelist. But you get the sense that he saw his students rabidly reading J.K. Rowling’s books and thought, I can do that. Not so much. Watching this movie, adapted by Craig Titley, your appreciation for the complexity and vastness of Rowling’s vision only grows. With all its cheesy effects and sylvan swordplay between kids in jeans, sheaths, and leather boots, “The Lightning Thief’’ feels like a cross between “Clash of the Titans’’ and a renaissance faire.
That Chris Columbus has been recruited to direct only compounds that ersatz “Potter’’ feeling. Columbus made the first pair of “Potter’’ movies -- the only two that could double as a couple of Ambien. His shameless jump to a rival team is a move only Brett Favre could appreciate.