<P> Percy Jackson: Sea of Monsters (also known as Percy Jackson & the Olympians: The Sea of Monsters) is a 2013 American fantasy adventure film directed by Thor Freudenthal . It is the second installment in the Percy Jackson film series and is loosely based on the novel The Sea of Monsters by Rick Riordan . It is a stand - alone sequel to the 2010 film Percy Jackson & the Olympians: The Lightning Thief . </P> <P> The film continues the adventures of Percy Jackson (Logan Lerman) and his friends, as they search for the Golden Fleece at the Sea of Monsters . Brandon T. Jackson, Alexandra Daddario, and Jake Abel reprise their roles from the previous film, while Nathan Fillion and Anthony Head replace Dylan Neal and Pierce Brosnan . New additions to the cast include Leven Rambin, Douglas Smith, and Stanley Tucci . The film was produced by Michael Barnathan and Karen Rosenfelt . Chris Columbus, who directed Percy Jackson & the Olympians: The Lightning Thief, serves as executive producer . The plot centers on Percy and his friends as they journey to the eponymous Sea of Monsters to retrieve the Golden Fleece in order to save the tree (barrier) that protects their home . </P> <P> The film was released in North America on August 7, 2013, receiving mixed critical reviews and became commercially successful having grossed over $202 million at the box office exceeding its $90 million budget . The film was released on 3D Blu - ray, Blu - ray, and DVD on December 17, 2013 . </P> <P> While in Camp Half - Blood, Percy recounts the story of Thalia and her sacrifice . A young Annabeth, Luke, Grover and Thalia are running to Camp Half - Blood while being pursued by monsters . Thalia sacrifices herself to get the others into the camp, and her father Zeus transforms her into a pine tree, creating a magical border around the camp . Soon a Cyclops passes through the border and is revealed to be Tyson, Percy's half - brother . The camp is later attacked by a Colchis Bull who breaks through the border and ravages Camp Half - Blood . Percy defeats it with the help of Tyson, Annabeth, and Clarisse . Following this, Luke (who had survived his and Percy's battle in the previous film) appears and confronts Percy, trying to convert him to his cause . When Percy refuses, Luke disappears . </P>

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