S1, E1: Adventurous teen Hunter Steele follows his grandfather's directions in search of a doorway to the Inner World. Deep inside an ancient pyramid, Hunter acquires a unique manacle and falls into a new and frightening land deep within the earth. Hunter is almost killed by a giant, talking spider named Shadow until the unlikely pair are forced to team-up as Spider and Rider to combat the Invectid forces of the evil Mantid. But will their uneasy alliance survive the battle?