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When a new substitute shows up, K.O. and Dendy decide they need to get their old teacher back.
At Lakewood Plaza Elementary, Miss Quantum is replaced with Ernesto who begins enforcing memorization instead of actual learning. K.O. and Dendy realize that they need to get their old teacher back who does not want to return and instead go back to her original passion, being a supervillain named Bad Apple.
- Miss Quantum
- Principal Claus (debut)
- Lion Cat
- The song, "Textbook Train" is a spoof of "Casey Junior" from the Disney film Dumbo.
- This episode takes place after "Mystery Science Fair 201X" as it shows what was the rivalry between Dendy and Miss Quantum.
- Also from the same episode, Bobo is no longer suspended from school.