Was there any reason given why Rat King only appeared in a single episode?

[Original TMNT Cartoon Fan]

Originally Posted by FredWolfLeonardo

I find it odd as to how a secondary tmnt character appeared so often in the Original cartoon (10 episodes, mentioned in many more) while hardly ever appearing in the 2k3 series (barely 3 episodes).

Its usually the other way around.

I think the original Rat King could carry some episodes in the 4 Kids series (except the one he just came up from the sewers to steal a pizza). Maybe he shouldn't play the flute to control rats.