Shadow of the Elves
The Master Builder
S1 E3:
One day, the Elf inventor, Snakehammer is hit by a falling chestnut and loses his memory. The trolls "adopt" him - in return he constructs an enormous machine, which paves the way to erecting a new city "Trollopolis". Thalia and Daiman's efforts to stop Snakehammer and his machine fail miserably.