The nineteenth episode of Thunder Mask.
- An Aesop: This episode has one told in quite a peculiar way even by tokusatsu standards: "Kids, don't do drugs... because if you do your brain will be fed to a monster so it can grow big and wreck the city."
- Behemoth Battle: Thunder Mask vs. Thinnerman.
- Defeat Equals Explosion: Befalls Thinnerman.
- Make My Monster Grow: Thinnerman is distinct amongst the Devil Beasts in that it only grows after being fed the brains of humans addicted to paint thinner.
- Monster of the Week: Brainwave Devil Beast Thinnerman
