Arriman

Arriman is the primary villain in Power Rangers Wild Fury. He's the leader of the Mutatrons and the boss of Toxxus, Noxxus, and Pestilencia.

Biography
Once known as Coran, Prince of Terrestria, he became Arriman when he ingested an experimental serum that had been tainted with the remains of the original Master of the Mutatrons and became possessed by his essence.

Power Rangers Wild Fury
Arriman led the Mutatrons in many battles against the Rangers, but they were always defeated. This was partly due to the personality of Prince Coran struggling to gain control. Several times his good personality succeeded in overpowering Arriman's evil personality, but always wound up being buried beneath Arriman's stronger evil. Eventually Arriman realized that the part of him that was Coran was holding him back and decided to separate the two of them. He succeeded, but Coran fell into a coma and was taken back to Terrestria to recover. At that point, the Master fought the Rangers on his own, unhindered by Coran’s goodness. Eventually, the Master kidnapped King Arion and plotted to use his power to conquer the world. He only partially succeeded. After a long and arduous battle, they managed to defeat him, but lost a lot of their Wildzords in the process. However, the Wildzords were all resurrected in the end and teamed up to help the Rangers defeat the Master, finally destroying him, all except for a few pieces that were quickly destroyed by the Rangers to prevent his return. Thus the Master was never able to return again.