This is in my top 2 favorite Pinky and the Brain episodes, along with Spellbound (I really don't know which I like more). One of the main reasons I like it is because of them coming back after a long hiatus, which reminds me of me in real life, where I rediscovered Animaniacs more than ten years after watching it as a kid. Also, there's just a cool feeling to this one that I can't really describe. I think it's just from them being shown in the '50s. Since they froze themselves for forty years, they knew they were coming out in the '90s, so I guess they knew what an awesome time it were going to be. I'm really surprised their plan didn't work in this one, though. They figured the kids, now adults, would have enough love for them that they would give them control of the world. I know if the Warners came back right now I would have no problem with them running the planet.
"If the doors of perception were cleansed every thing would appear to man as it is, Infinite." --William Blake