In the middle of ToonVille, where all cartoons live, sits the ToonMart, where all cartoons hang out. Marty works at the ToonMart, which he likes to think was named for him. It was not, even if some people do call him ToonMart Marty!
Marty gets so smart that his head expands. Dr. Smartypants tells Holly and Burnie that if he learns one more thing his head will explode. While keeping all new information from him, they try to bring him back to normal.
S2E6 22 min