Master Org was the ruler of all the Orgs and the main antagonist of Power Rangers Wild Force.
Master Org actually refers to two individuals; the original Ancient Master Org from 3,000 years prior to modern day and Dr. Viktor Adler, the man who took up his identity and later became the vessel of the former's reincarnated self.
The original Master Org was the leader of all other lesser Orgs. He rose up beneath Animaria and summoned an army of Orgs which he used to attack the peaceful kingdom. During the war, Master Org used the power of the Org Heart and managed to defeat and destroy Animus, making the Orgs victory seem certain. This led Merrick to acquire the Wolf Mask which had the Org Zen-Aku imprisoned within. With its power, he summoned the Predazord, engaged Master Org in battle, and managed to defeat him, causing the remainder of his army to retreat. Even so, Zen-Aku soon broke free from his prison and possessed the warrior, prompting his comrades to seal him. Unbeknownst to them, remnants of Master Org had survived his destruction, taking the form of seeds which rested somewhere in the Amazon rainforest and was subsequently discovered by Dr. Viktor Adler, Richard Evans, and Elizabeth Evans 3,000 years later during the their expedition to find the Animaria.
Viktor Adler, the human who would become the imposter and soon the true Master Org, was born in 1948 and was a scientist. He was originally a friend and colleague of Richard and Elizabeth Evans, as well as secretly having feelings for the latter. The trio worked together to prove the existence of the Animaria and eventually gained enough funds to begin their expedition. Around that time, Viktor wished to propose to Elizabeth, only to learn that Richard (who she had already gotten together with) had just beaten him to it. Elizabeth soon became pregnant and gave birth to her and Richard's son, Cole. To add insult to injury, Dr. Adler found himself left out of the spotlight during the press conference prior to the beginning of their aforementioned expedition.
In 1982, embittered by Richard "stealing" his only chance at love, a family, and fame, Viktor swallowed the Master Org's remnants upon finding them to gain his power, allowing him to exact his revenge. Driven insane by his hate and vengeance, he killed his colleagues in cold blood with his newfound powers. However, never found Cole as Elizabeth had hidden her infant son in the jungle, where he was taken in and raised by a tribe. From then on, Viktor assumed the identity of Master Org, and continued his mission of wiping out humanity and taking over the Earth by recruiting newly arisen Org spirits to battle the Rangers.
Somehow avoiding the influence of the Z-Wave that occurred four years ago and shortly after the awakening of Toxica and Jindrax, Viktor Adler comes to the Nexus posing as the real Master Org and demands their loyalty.
After the Rangers discovered the Elephant Wildzord, Master Org sensed it as well and sends Toxica and Jindrax to capture Princess Shayla to force her to release it for him inside a cave, but after she reveals herself to be unable to do so as it did not choose her to be its guardian, Master Org then decides if he cannot have it, no one will and destroys the carving, knocking Shayla and Alyssa unconscious before vanishing.
One day, Master Org, who was sitting in his room, was discovered adjusting his horn by Toxica (who also sensed a human scent coming from him), much to her shock and horror. She quickly escaped before Master Org could see her, but not without him hearing someone outside his throne room and wondering who it could be.
When the Red Lion becomes ill from using the Bear Wildzords' finisher, Master Org realizes the Rangers will try to find the Soul Bird to heal him, so he decides to stop them by sending Bulldozer Org to destroy the forest. After Cole separates from the others, he meets Master Org in person for the first time, who confirms that he was responsible for the forest's destruction and soon attacks the Red Ranger after he called him a coward. During their fight, Cole's old family photo falls off and Viktor curiously picks it up. To his shock, he recognizes the couple on it as his two former colleagues Richard and Elizabeth, and remembers the day he became Master Org and destroyed his two companions, but not before Elizabeth refused to tell him where she hid her son. Back to the present, Viktor realized, much to his surprise that the Red Ranger is the son of the people he murdered. He soon attacks the Soul Bird with his staff after noticing it and taunts his foe about it being unable to be seen twice. Just before he could attack him again, they are interrupted by a strange earthquake, and Master Org retreats but not before promising Cole they will finish their fight later.
Master Org finds Retinax after his defeat by the Soul Bird but the latter (having served the original Master Org) fails to recognize him, confused as to who is standing before him. Fearing this could expose him, Master Org destroyed Retinax to protect his identity, leadership position, and existence.
Master Org revives Nayzor and gives him a job for awakening the Duke Org Zen-Aku.
Master Org finds Zen-Aku in the middle of the night and asks if he remembers him but the Duke Org mentions that he does not remember anything at all.
When Zen-Aku is about to lose from the full moon and demorph to Merrick, Master Org orders Nayzor to get the full moon back before Merrick loses his control and reverts back to Zen-Aku, unable to come back to his senses.
Merrick later confronts Master Org and tries to take the Animal Crystals back from him, but he's powerless and his efforts are futile. Master Org managed to use the power of Animal Crystals to create the Quadra Org.
Toxica and Jindrax remain loyal to Master Org but abandon him after discovering he is a human imposter with Org powers upon Toxica's revelation of seeing him move his horned helmet. Still needing their help, Master Org uses his evil vines to brainwash them into his completely loyal generals.
After many defeats, Master Org creates the Tombstone Org from his own tombstone. Though powerful, Tombstone Org is later sealed away forever.
After the defeat of the Tombstone Org, Master Org has Toxica revive the fallen General Nayzor using his crown that survived his destruction, and grant him a new and more powerful form to take on the Rangers. In a battle against Cole and his new Animarium Armor, Toxica and Jindrax are freed from Master Org's brainwashing. After the Falcon Summoner slays the revived Nayzor, Master Org personally comes to enlarge him with Org Seeds but the General Org is destroyed once more by the Rangers' new Isis Megazord, and much to his surprise, he notices that Toxica and Jindrax left the scene.
Having being abandoned by Toxica and Jindrax and feeling that his defeat was coming, Master Org decided that he was going to take the Rangers down with him. Assuming the appearance of Viktor Adler, he allowed himself to be found knowing Cole would come to him looking for information on his missing parents. When he did, Master Org wasted no time in knocking Cole out and taking the other Rangers captive in vines. Taking them to an abandoned factory, Master Org revealed himself to Cole and told him about how he had killed his parents as revenge for their 'betrayal'. Although Cole was shocked, he refused to allow this to destroy his spirit and fought back when Master Org attacked, eventually reflecting a full-power energy blast back at him. This caused Adler to lose his Org powers and revert back to a human. Cole, seeing what a desire for revenge had done to Adler, refused to follow the same path and left him pathetically sprawling on the ground. Wandering the desert, Adler came across Toxica and Jindrax, who had revived the third General Org, Mandilok. The awakened Org wasted no time in throwing Adler off a cliff. However, as Adler's body lay lifeless on the ground, an actual Org horn sprouted from his head just before he woke up, signifying the rebirth of the real Ancient Master Org.
After spending some time planning his return, with both the Rangers and the other Orgs believing him to be dead, Master Org sends the Duke Org Onikage to arrange for his reveal by destroying the Orgs who have betrayed him, succeeding in destroying Toxica. When he arrives, he easily destroys Mandilok and kidnaps and imprisons Princess Shayla, while Jindrax barely escapes destruction as well. He later uses Org Beans to enlarge Onikage as a cover for his escape before taking Shayla to the Nexus.
Master Org steals Shayla's necklace and uses its power in a ceremony to recreate the Org Heart. He decides to revive Retinax, Nayzor, and Mandilok to distract the Power Rangers. Although the Jungle Blaster destroys the Org Generals forever and the Nexus is destroyed as a result of his ceremony, Master Org managed to swallow the Org Heart and what was left of his human body crumbles to ashes,
The Org Heart survives the Nexus' destruction and constructs a new form for Master Org which resembles a composite of Retinax, Nayzor, Mandilok, Jindrax, and Toxica (despite the last two surviving). A few days after the defeat of the Orgs and the Nexus' destruction, the Rangers are celebrating their victory but detect a powerful Org and find the enhanced Master Org. Despite being heavily outnumbered, Master Org fights and defeats all of them and is even able to destroy the Animarium Armor before growing giant. He quickly attacks the Animarium, destroying Animus (for the second time) and the Predazord with ease when they attempt to stop him. Master Org is seemingly destroyed by the Kongazord Striker's Final Strike but the Org Heart quickly reforms him and he then destroys all of the Wildzords before bringing the Animarium down to Earth. Without the Wildzords, the Power Rangers are powerless so Master Org attacks Turtle Cove with an army of Putrids that night after creating a large storm. Although the de-powered Rangers fight off the Putrids, they are still no match for Master Org but their determination to keep fighting causes all of the destroyed Wildzords to come back to life, joined by many others that have been lying dormant in the world, restoring the Rangers' powers. The Zords combine their powers into an Ultra Roar, violently ripping into and obliterating the cowering Master Org's body. The Org Heart itself survives the attack but the six Wild Force Rangers use the Jungle Sword's Savage Slash to destroy it before it can restore his body again, ending the threat and legacy of Master Org forever.
After the demise of Master Org, the Org threat was permanently erased, and Dr. Adler could finally rest in peace, his corrupt life and suffering over. Later, Cole visited Dr. Adler's grave and presented some flowers in front of his tombstone alongside those of his parents. Having forgiven the scientist and decided to move on, Cole told him that someday he would finally know peace.