The Tree and the Dragon Trollz : Season 1 Episode 16

Frustrated by Obsidian's refusal to reveal the identities of the other two Ancients. Onyx and Topaz go on a midnight mission to unmask the mysterious missing Ancients. Following a vision from a dream, Onyx leads the way to find Zirconia - an Ancient who's been trapped transformed into a tree. The two save Zirconia from captivity, but its Obsidian who saves all three from becoming dragon fired rotisserie.