During the Vietnam War, a recon unit ventures to an isolated jungle valley to uncover the fate of a missing platoon. They soon find themselves in a fight for their lives against an unexpected enemy — prehistoric dinosaurs.

Elaine "Ellie" Harrison has just moved from Minnesota to Annapolis, Maryland while her parents take a year-long sabbatical to continue their medieval studies in nearby Washington D.C. Her new high school, Avalon High, seems like a typical high school with the stereotypical students: Lance the jock, Jennifer the cheerleader, Marco, the bad boy/desperado, and Will, the senior class president, quarterback, and all around good guy. But not everyone at Avalon High is who they appear to be, not even Ellie herself. Eventually, it becomes apparent that Avalon High is a situation where the ancient Arthurian legend is repeating itself.