Ivan Ooze
Described as a "morphological being" and a "monster," Ivan Ooze ruled Earth 6,000 years before Angel Grove existed. He was imprisoned within a hyperlock chamber and buried underground by a group of young warriors under the command of Zordon. Before being imprisoned however, Ivan succeeded in wounding Zordon so severely that he could not survive outside of his time-warp.
6,000 years later, in modern-day Angel Grove, Ivan's hyperlock chamber was discovered by construction workers and unearthed. Zordon immediately sensed this and sent the Power Rangers to ensure that the hyperlock chamber was buried. However, Rita Repulsa and Lord Zedd got to the chamber first and freed Ivan. In return for releasing him Ivan promised to destroy both Zordon and the Power Rangers.
After creating an army of Oozemen to keep the Rangers busy, Ivan infiltrated and destroyed the Command Center. Although he shattered Zordon's time-warp cylinder, for reasons unknown he did not bother to finish him off. Ivan then went to the moon where he betrayed Rita and Zedd, trapping them inside of a snowglobe, taking over their empire and getting their disloyal minions Goldar and Mordant to join him.
When the Rangers journeyed to Phados in search of the Great Power to save Zordon, Ivan created a flock of Tengu Warriors and sent them to follow the Rangers and kill them, destroying them when they failed. In the meantime, he enslaved the minds of Angel Grove's parents using his ooze, forcing the to dig up his Ectomorphicon Titans, Hornitor and Scorpitron. He then commanded them to leap off a cliff to their deaths, but they were saved by Fred, Bulk, Skull, and the rest of Angel Grove's youth.
Ivan activated the Ectomorphicons and sent them to destroy Angel Grove, heralding a wave of death and destruction unlike anything the town had seen before. As he and Goldar looked on from a tall spire however, the Power Rangers returned, having gotten the Great Power from Phados, and new Zords with it. Much to Ivan's annoyance, they destroyed Scorpitron with their Ninja Zords, forcing him to liquify himself and merge with Hornitor.
In his giant form, Ivan, using the spire as a staff, battled the Rangers' Ninja MegaZord, a battle that threatened to destroy Angel Grove even more than it already had been. The Rangers lured him into space so their fighting would not endanger any more innocents, and then they remembered that Ryan's Comet was supposed to pass by. A kick in the groin knocked Ivan into the path of Ryan's Comet, and it collided with him, destroying his evil forever.
