||WARNING: This episode contains scenes of blood. Viewer discretion is advised!
Revenge of Zen-Aku is the thirteenth episode of Power Rangers Wild Force, continuing the Zen-Aku arc that began in the Curse of the Wolf. It introduces the subplot connected to future Ranger, Merrick Baliton (a guardian of the Animarium from 3,000 years ago).
Zen-Aku frees Motorcycle Org, and kidnaps Princess Shayla. Shayla's necklace brings back vague memories for Zen-Aku. The Rangers battle Motorcycle Org and Zen-Aku, and get back the Princess.
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