Gnomes and Trolls: The Secret Chamber.

Junior, a teenage gnome, wants nothing more than to invent gizmos and gadgets in his tree-house laboratory. But Junior's old school father, Jalle, the head gnome of the forest, would prefer his son follow in his footsteps and one day be in charge of his own forest. In spite of their differences, on the eve of the first winter storm Junior helps Jalle distribute food rations. Then disaster strikes.