When was the very first episode in the OT that the Turtles first enter and explore Dimension X? (I know it wasn't seasons 1-3 based on the plots.)
After watching so many episodes, I can't seem to narrow down the precise episode because it seems by the later seasons the Turtles find the dimension so familiar. Were they shocked though upon first arriving there (or at least Donatello being scientifically curious) or was that a plot hole of sorts when the Turtles seemingly know where everything is in Dimension X with their initial encounter?
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