Dennis gets a new principal, Mr. Spivey, who is very strict at his school. Mr. Spivey and Dennis get off on the wrong foot, at first. Johnny Brady takes note of this because he wants to be on the pitcher on the school's baseball team. He sets Dennis up by drawing a picture on the back of Dennis' paper making fun Mr. Spivey's height. When Mr. Spivey finds it, he assumes Dennis is the one that drew it. He punishes Dennis by kicking him off the baseball team and keeping him after school. As the news travels, Mr. Wilson, Mr. Quigley, and Mr. Finch all go to the school a few minutes apart and talk to Mr. Spivey - each claiming to be Henry Mitchell to stand up for Dennis. Mr. Spivey gets confused but soon realizes he misjudged Dennis and ends up apologizing and putting Dennis back on the school baseball team.