Team Trollhunters had been sent to the past and must face Tella-Durr the Terrible. Jim must help prepare and train the Gogun the Gentle and meet two unexpecting allies to help along the way. While Talia is stuck in the present dealing with Vendel's great grandfather Kilfred from getting the trolls into trouble and babysitting the Creepslayerz at the same time. How'll fix this?