In this story of Percy Jackson; Clarisse is to go on a quest for the golden fleece to save Thalia's tree from dying. Not only does Clarisse go after the fleece but Percy, Annabeth, Grover, and Tyson secretly go after the fleece to stop Luke from getting it so he can raise Kronos and destroy Olympus. During the movie you also run into other characters like Hermes, the two snakes around his staff thing, Dionysus, the monster that guards the sea of monsters, Polyphemus, and Blackjack. Luke ends up with the fleece and raises Kronos but Percy destroys Kronos for now. After Percy grabs the fleece from the thing holding Kronos; a Manticore kills Annabeth so they use the fleece on her and then they all go back to the camp to save Thalia's tree. The fleece works a little to well and brings back Thalia herself.
I don't remember Kronos eating Luke or Grover, Luke meeting Polyphemus, Annabeth getting killed, or Clarisse being nice to Percy, Annabeth,and Grover.