Once season 4 started on CBS, they aired two new episodes per week in an hour-long block (with Turtle Tips in between). Usually, the first half hour of the block was a "Shredder and Krang" episode, and the second episode was a "Mad Scientist" episode. Usually the second episode focused on a single Turtle as well. I think the reason there are so many lame Mad Scientist episodes in season 4 is thanks to the hour-long format and them trying not to make it the Shredder hour.
I think Season 8 finally changed it to a half hour block along with the Action Zone shows, but Shredder was written out of the show shortly after.
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