Two trolls in an epic battle lead to consequences in the human world, especially for one boy.

Still reeling from discovering the amulet's power, Jim meets with his new mentors, and learns about the sacred responsibility he has been tasked with.

Toby and Jim tour Heartstone Trollmarket, where Jim starts his training; the presence of a human Trollhunter creates resentment.

Jim gets a crash course in troll history, and is faced with problems, his first mission and a bully.

During a field trip to a museum, Jim tries to get closer to Claire; Jim discovers that the museum curator has a surprising secret.

Jim gets ready for a high-stakes rematch against Draal, who seems to be the amulet's rightful heir; a surprising partnership emerges.