Don't Get A Big Head
S2, E10: Dr Phineus Phibes is convinced that the sole reason he is continually defeated by Scooby and Shaggy is that he is simply not smart enough. Phibes uses a nano-formula that makes him super smart.

S2, E10: Dr Phineus Phibes is convinced that the sole reason he is continually defeated by Scooby and Shaggy is that he is simply not smart enough. Phibes uses a nano-formula that makes him super smart.