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Zen-Aku is a powerful wolf-themed Duke Org and the anti-hero from Power Rangers Wild Force.


Bonding to Merrick

Cursed Wolf Mask

The Cursed Wolf Mask.

Not much is known about Zen-Aku's origins, except that his spirit was locked inside a cursed wolf mask. After the defeat of Animus at the hands of Master Org, Merrick decided that his only hope of stopping him was a legend about a cursed mask that could bestow great power upon the wearer. He found his way into the lair of the Org General, Nayzor, where he found the mask of Zen-Aku. Merrick put it on and gained its powers, using the Predazord to destroy Master Org, but immediately afterwards, the wolf mask seized control of his mind, merging him with and transforming him into Zen-Aku.

Zen-Aku being sealed

Zen-Aku being sealed by the five guardians.

With what humanity he had left, Merrick begged the other guardians of the Animarium to destroy him, but they refused to destroy their friend. Instead the guardians sealed Zen-Aku in an underground tomb, where he remained for 3000 years.


Zen-Aku Summons Dark Wildzords

Zen-Aku summoning the Dark Wildzords.

Zen-Aku Dark Wild Zords

Zen-Aku's Dark Wildzords; the Hammerhead Zord, Wolf Zord, and Alligator Zord.

Zen-Aku Bandages Alyssa

Zen-Aku bandages an injured Alyssa.

However 3000 years later, Zen-Aku was released by Nayzor to destroy the present day Animaria Guardians, the Wild Force Power Rangers. He possessed no memory of his past, only that he wanted to destroy the rangers in vengeance for their predecessors sealing him. Zen-Aku proved able to fight the rangers quite well, even using his own Wildzords, and succeeded in stealing the Elephant, Giraffe, Black Bear, and Polar Bear Animal Crystals and adding them to his collection of Dark Wildzords. However as time went by, Zen-Aku's past nature began revealing itself. Once he found the White Ranger, Alyssa, injured at the hands of Toxica, and bandaged her up instead of finishing her.

Zen-Aku rescuing Dog

Zen-Aku rescues a Wolf/dog pup.

Zen-Aku being possessed

Zen-Aku being possesed by General Nayzor's power so his vessel, Merrick, cannot retake the control of his body.

Another time, Zen-Aku saved a wolf/dog pup when it was in danger from his fellow Orgs, even attacking Toxica to protect it. He began to become confused, even more so when he started to have flashbacks of his past. Zen-Aku began to doubt himself even more when the spirit of Animus began to appear before him, telling him to "Remember", which confused the ranger as well, especially after Princess Shayla saw Zen-Aku bleeding (which Orgs are unable to do) and they saw his actions. As he came even closer and closer to realizing the truth, Nayzor eventually used an insect that took possession of the wolf Org's mind and made him into his willing servant.

Breaking Free

However Princess Shayla had begun to piece together the truth and later, Animus managed to cause a lunar eclipse that allowed Merrick to take back control. He told the rangers' what had happened to him, but then the eclipse ended, changing him back into Zen-Aku. Shayla managed to piece everything together and realized that the curse came from the Predazord, because after Master Org's defeat, the wolf mask had made the Wolf, Hammerhead, and Alligator Wildzord's evil and their guardian along with them. Shayla then told the rangers that the only way to free Merrick was to defeat the Predazord, which they succeeded in doing with help from the new Armadillo and Rhino Wildzords.

Finishing Matters

Zen-Aku confronts Merrick

Zen-Aku confronting Merrick.

However Merrick and Zen-Aku had unfinished business with each other and thanks to the mask being broken, the Wolf Org returned, this time determined to remerge with Merrick. Now he was even stronger then the last time, which Shayla explained was because when they had been bonded, Zen-Aku's evil power had been divided between Merrick, Zen-Aku, and the Predazord, but with Merrick and the Predazord good again, the Wolf Org had all his power to himself. Zen-Aku battled Merrick and almost succeeded in his goal, but was eventually defeated again with use of the Predazord's Revolver Phantom attack.

Traveling with Merrick


Zen-Aku approaching Merrick.

After Master Org was defeated again, Merrick set out to wander the world and was approached by Zen-Aku, who offered to join him, saying that they were both "lone wolves looking for redemption". Merrick accepted the offer and the two set off together.



Zen-Aku's Wildzords combined as the Dark Predazord.

Zen-Aku is quite powerful, able to take on all five of the rangers in close combat without too much difficulty. In battle, he wields a large crescent shaped blade that he can use to send out crescent shaped waves of energy. When Zen-Aku was bonded with Merrick, he played a knife shaped flute to summon the Dark Wildzords and could use his powers to corrupt Animal Crystals, in order to add the Wildzords they represent to his collection of Dark Wildzords. Zen-Aku's powers wax and wane with the moon, at the full moon he is at his strongest and when there is no moon, his powers were diminished enough to allow Merrick to take control. Zen-Aku can also grow to giant size, as he demonstrated after being separated from Merrick and losing the Dark Wildzords.



  • Zen-Aku's manner of summoning his Dark Wildzords by playing on his flute is similar to how Tommy Oliver summoned the Dragonzord by playing on his Dragon Dagger like a flute.
  • Zen-Aku's name means "good-evil" in Japanese.
  • When the Predazord was under Zen-Aku's control, its head resembled him.
  • Until episode "Unfinished Business", Rangers believed that Zen-Aku was simply Merrick's evil self as result of being exposed by the dark power within the cursed wolf mask. When Zen-Aku returned as a full-Org and went after Merrick, they finally learned that Merrick and Zen-Aku were separate entities and thus, how Merrick and Zen-Aku's relationship was more like possession.

See also

Duke Org Rouki - Super Sentai counterpart in Hyakujuu Sentai Gaoranger.

Power Rangers Villains

Mighty Morphin
Rita Repulsa | Goldar | Finster | Squatt and Baboo | Putty Patrollers | Scorpina | Lokar | Lord Zedd | Rito Revolto | Master Vile | Blue Globbor | Hydro Hog
Machine Empire | King Mondo | Queen Machina | Prince Sprocket | Klank & Orbus | Cogs | Louie Kaboom | Prince Gasket | Archerina
Divatox | Elgar | Rygog | Porto | Maligore | Piranhatrons | Putra Pods | Chromites | General Havoc
In Space
Astronema | Dark Specter | Quantrons | Ecliptor | Darkonda | Psycho Rangers
Lost Galaxy
Furio | Stingwingers | Scorpius | Trakeena | Treacheron | Deviot | Villamax | Kegler | Captain Mutiny
Lightpseed Rescue
Diabolico | Vypra | Loki | Jinxer | Batlings | Queen Bansheera | Prince Olympius | Triskull
Time Force
Ransik | Nadira | Frax | Gluto | Cyclobots
Wild Force
Jindrax | Toxica | Viktor Adler | Putrids | Retinax | Nayzor | Zen-Aku | Ancient Master Org | Mut-Orgs | Mandilok | General Venjix | Onikage | Master Org |
Ninja Storm
Lothor | Marah & Kapri | Zurgane | Choobo | Kalzaks | Motodrone | Vexacus | Shimazu
Dino Thunder
Mesogog | Tyrannodrones | Elsa | Zeltrax | Triptoids | White Ranger Clone
Troobian Empire | Emperor Gruumm | Krybots | Mora | Broodwing | Mirloc | A-Squad Rangers | Omni
Mystic Force
Koragg | Morticon | Necrolai | Hidiacs | Styxoids | Octomus the Master | Imperious | Barbarian Beasts | The Ten Terrors (Sculpin | Magma | Oculous | Megahorn | Hekatoid | Serpentina | Itassis | Matoombo | Gekkor | Black Lance)
Operation Overdrive
Flurious | Moltor | Lava Lizards | Miratrix | Kamdor | Chillers | Fearcats (Mig | Cheetar | Benglo) | Thrax
Jungle Fury
Jarrod | Dai Shi | Camille | Rinshi | Five Fingers of Poison | Carnisoar | Jellica | Grizzaka | Scorch | Snapper | Whiger
Grinders | Venjix Computer Network | General Shifter | General Crunch | Tenaya 7 | Kilobyte
Master Xandred | Dayu | Octoroo | Robtish | Deker | Arachnitor | Moogers | Serrator | Papyrox | Professor Cog | Sergeant Tread | General Gut
Admiral Malkor | Vrak | Creepox | Loogies | Zombats | Bigs | Bluefur | Metal Alice | Messenger | Prince Vekar | Princess Levira | Damaras | Argus | X-Borgs | Bruisers | Tresnag | Drill Horn | Emperor Mavro
Dino Charge
Sledge | Fury | Wrench | Poisandra | Curio | Heckyl/Snide | Singe | Lord Arcanon | Doomwing | Vivix | Vivizords | Spikeballs
Ninja Steel
Galvanax | Ripcon | Madame Odius | Cosmo Royale | Kudabots | Bashers | Skullgators
Ivan Ooze | Mordant |

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