


In the book, the gods were too arrogant to think to guard their possessions while the half-bloods were on Olympus for a sort of field trip, whereas in the film, Zeus had passed a law forbidding contact between the gods and their children, so Luke wouldn't have been on Olympus to begin with. Not only does the film not explain how Luke stole the bolt in the first place, but it adds in something that undermines the book's explanation for how it happened.Annabeth's hair goes from blonde to brown, and Grover's from red to black.In the film, the former two are blonde and the latter two have brown hair. In the books, Zeus, Poseidon, Hades, and Athena were all depicted with black hair.At the same time, it's been upgraded so that Zeus apparently can't summon or control any lightning without it in the book, while it was his superior weapon, he was mentioned as having an arsenal of thunderbolts fashioned after it that he could still use even in its absence. In the book, it was said to be more powerful than a hydrogen bomb, whereas when Luke uses it in the film, the most it does is blow small chunks off of buildings. Adaptational Wimp: Zigzagged with regard to Zeus and his master bolt.In the film, he's changed into a proper villain who wants the bolt so that he can overthrow his two brothers and take control of Olympus himself, and goes back on the promise he made to Percy once he has it. Turns out Hades was only after him because he thought Percy had stolen his Helm of Darkness as well, and it's implied he was even going to return the bolt to Olympus once he managed to recover it. Adaptational Villainy: In the book, Percy assumed Hades had stolen Zeus's master bolt because Everyone Hates Hades.There also isn't mention of him forbidding Percy from flying, as he did in the book, and his most notable contribution otherwise passing the law that forbade gods from being in contact with their half-blood offspring only came about because Poseidon was neglecting his duties by doing so, to the point that he was starting to become mortal. He still pins the theft of his bolt on Percy, but as the film cuts out the obvious means through which Luke did it, its not quite as much of a leap to have made he also accepts Percys explanation about what really happened without argument, and even agrees upon request to bring Grover back from the Underworld. Adaptational Nice Guy: This portrayal of Zeus comes off as much more reasonable than his book counterpart.Adaptational Jerkass: Percy is significantly ruder and more selfish than he was in the books.Whereas in the film, she is seen urging Zeus to think rationally so that they can settle things without starting an unnecessary war. In the book, she was mentioned as being the only one of the Olympians who had taken Zeus's side in the conflict instead of Poseidon's, presumably due to the mutual grudge between them affecting her common sense. Adaptational Intelligence: Athena appears to get this treatment.Adaptational Early Appearance: The Hydra first appeared in the second book while it shows up in the first film.He's also responsible for defeating the Hydra by using Medusa's head to turn it into stone. He's shown to be adept at Cane Fu, as Gabe learns the hard way. In the movie, he's played by the much better-looking Conrad Coates, whose one close-up features nothing grotesquely abnormal about him. Even when said to have cleaned himself up a bit, he's still not noted to be especially handsome. Hephaestus is described in later books as being a hulking, misshapen brute with a leg brace and a wild beard that bursts into flames on occasion.

In the books, Luke had a prominent facial scar.In the film he's portrayed by an attractive Logan Lerman. Percy himself in the books he's a typical, slightly pudgy 12-year-old child.Medusa in the book is described as a hideous old crone.
