It's a No-Brainer

"It's a No-Brainer" is the first half of the 3rd episode of season 5 of the animated children's series Arthur. It originally aired on September 18th, 2000.

Summary
Buster beats the Brain at a class Math-a-thon, so the Brain gives up on his studies and Buster must represent the class. Buster realizes that he can't represent the class and comes up with several plans to turn the Brain back to the way he is.