Merrick Baliton is the Lunar Wolf Ranger.
His Silver Wolf, Violet Hammerhead Shark, and Emerald Alligator Zords combine to form the Predazord.
He was once one of the original six warriors of Animaria. He witnessed the battle between the ancient, evil Master Org and Animus (a force for good). When Animus fell, Merrick took it upon himself to defeat Master Org. Knowing that he did not have enough power to defeat Master Org alone, he donned a cursed wolf mask which gave him the power of the Duke Org sealed in it called Zen-Aku. With this power, he was able to defeat Master Org. However, he was soon corrupted by the mask's power and Zen-Aku took control of his body. Merrick pleaded with his comrades to kill him before the mask took complete control. He was then taken over completely by the mask's power and attacked them. But rather than kill Merrick, they sealed him into a stone-coffin in order to protect the world from Zen-Aku's power.
Centuries later, he was released by Nayzor to destroy the Wild Force Rangers of the present day. As Zen-Aku, he battled them on several occasions. But he was not all evil. When Alyssa was gravely injured by Jindrax and Toxica, he bandaged her wound that could have broken her ankle while she was unconscious. The fighting went on until the Power Rangers learned the truth and helped free him from the curse, with help from the Rhino and Armadillo Wild Zords. Princess Shayla had figured out the curse's power was tied to his Zords and had the Rangers destroy his Zords as the Predazord, breaking the curse. Before that, it seemed like Merrick was gaining short busts of control, such as when he saw Alyssa lying injured and unconscious after tumbling down a hill, he stops to bandage up her wounds. Merrick soon became the Lunar Wolf Ranger and comes to the others' aid when needed. He is also the strongest Ranger of them all, as he was able to defeat the others while he was still Zen-Aku.
Unfortunately, breaking the curse also freed Zen-Aku from his curse and he returned to do battle with the Rangers. Merrick had to face his apparently unbeatable dark side, but using a new pool trick he learned from his friend and boss Willie, Merrick weakened Zen-Aku and destroyed him himself with the help of the Armadillo Zord. Its later revealed that Zen-Aku somehow survived, but he seeks redemption now like Merrick.
