Annabeth Chase

Annabeth Chase is the deuteragonist of the 2010 film adaptation of Percy Jackson & the Olympians: The Lightning Thief and the tritagonist in its 2013 sequel, The Sea of Monsters. She is one of Percy's best friends (along with Grover Underwood) and love interest in both films.

Role in the films
Background

As a child, Annabeth ran away from home and was eventually found by Grover Underwood, Luke Castellan, and Thalia Grace at the age of five. As she and her friends were making it to Camp Half-Blood, Thalia stayed behind to give them a fighting chance. To her horror, Annabeth watched as the Cyclopes hunting them fatally wounded her. However, Zeus took pity on his daughter and turned her into a tree to save her life. Since the experience, Annabeth grew to fear and hate Cyclopes, explaining her unease with Tyson when she first met him.

The Lightning Thief
She and Percy get off on the wrong foot during a game of capture the flag. Though she wins the fight at first, Percy uses the water to heal himself and fights Annabeth back and bested her in a swordfight. Later during the campfire, Annabeth reveals it's nothing personal because her mother and his father have a rivalry with each other. After Hades revealed that he had the Minotaur abduct his mother. Annabeth joins Percy and Grover on their quest and received things from Luke to a pair of flying shoes, and a shield and bag.

Annabeth yells at Percy to stop beheading the Hydra but he finishes it off. Exasperated, she yells to him that once you play a hydras head a grows into two more, but its too late because the Hydra regenerates. Instead, they turn it to stone with Medusa's head.