Although Trevor (Brendan Fraser) is a professor of geology at the university, he often does things that challenge tradition. He believes that Verne's novels are not science fiction, but real. It is because of such opposing theories that he was passed on as a joke in the college, which ruined his academic reputation. But Trevor didn't care about these, he firmly believed that his theory was correct. In order to verify his theory, Trevor took his nephew Sean (Josh Hutcherson) and the local guide Hannah (Anita Briem) to start his trip to Iceland. While traveling, the three accidentally discovered a strange cave, and broke through the thin ice and fell into the bottomless abyss when they were exploring. However, when they woke up, they found a mysterious world in the center of the earth, which was filled with all kinds of strange creatures, exactly the same as the scenes described in Verne's novels. The evidence was finally found, but how to bring the evidence back to the ground? Trevor and the other two began their journey to find a way out...