Ivan Ooze is a character from the "Mighty Morphin Power Rangers" universe who appeared in the 1995 film "Mighty Morphin Power Rangers: The Movie." He is not part of the television series' third season but rather serves as a major antagonist in the film. In the storyline, Ivan Ooze is an ancient evil that was imprisoned by the Power Rangers' ancestors and is released after being discovered by Lord Zedd and Rita Repulsa.
Ivan Ooze briefly allies with Lord Zedd and Rita, but he has his own agenda and seeks to take down the Power Rangers for personal reasons, primarily to gain control and wreak havoc. The film's narrative centers around his plan to destroy the Power Rangers, at which point he becomes a formidable foe.
Master Vile, on the other hand, is introduced later in the series as a powerful villain and the father of Rita Repulsa. His takeover of Rita and Zedd's Space Dungeon is a plot point that occurs after the events of the movie.
The timeline can be somewhat confusing because the movie was released during the run of the TV series, but eventually, the show continued with its plot arcs and characters beyond the film's events. Ivan Ooze's character is significant in the film but does not directly impact the TV series' third season plot outside of the movie's context.