So I had this crazy idea….
In the theme song for Pinky and the Brain it says “One of them is a genius, the other’s insane.”
What if Pinky were actually the genius and the Brain was actually insane?
Think about it. We’re watching the show from Brain’s point of view. In his mind the world is a dark evil place that needs to dictated. He suffers from anxiety and narcissism and believes himself to be amazing and fitting for being Dictator.
Pinky is actually the genius and believes in the innocence of the world. This has Pinky looking for a solution to World Peace causing Brain’s imagination to want to find World Dominance with Pinky screwing up his plans. Due to this, Brain sees Pinky as naive and insane. So we are watching Pinky as Brain perceives him.
Because they’re ‘cellmates’ and Pinky sees the good in everyone, he actually sees himself as Brain’s caretaker and is trying to help him. Pinky’s phrases like “Narf” are actually trigger words to get Brain to calm down if he starts to get too carried away. Pinky’s watching t.v. and random behaviors is actually him doing research on the world, another thing that Brain finds stupid so is relayed out as Pinky being stupid and making him stupider instead of smarter.
The reason the plans end when the sun comes up is because Pinky has conditioned Brain to fall asleep at sunlight. Pinky’s always asking Brain questions as a form of therapy to let Brain talk and get it out of his system. When Pinky repeats what Brain says, Brain’s mind sees it as mocking, but Pinky is jotting notes and talking back to him as a doctor.
They never actually leave the cage. All of that is part of Brain’s imagination for his ‘plans’.