Calvin warily approaches his bike. He says "easy now". He gets closer and says "steady boy....nice bike". Suddenly, the bike rears up and startles Calvin. Calvin peeks at the bike from behind a tree.

Calvin comes into the house all scarred and dirty. Dad asks what happened to him. Calvin tells him the bicycle tried to kill him. Dad asks if he fell off. Calvin says it took 40 minutes to subdue it to the point he could climb on, then it bucked him over the handlebars. Dad asks if he fell off. Calvin tells him it then tried to run him over. He says he's lucky to be alive. Dad tells him balancing takes a little practice. Calvin asks Dad if he has a rifle and if he'll shoot the bike.

Calvin peeks out the door. After he's outside, the bike peeks around the corner at him. The bike chases him down the street. Looking at Calvin lying on the ground, Dad says maybe they should get his inner ear checked.

Susie sees Calvin behind the tree. Calvin tells her to be quiet and asks if she's seen his bicycle. Calvin whispers to Susie that if his bike doesn't get him first, he's going to cut its spokes. He says she never saw him today. After Calvin leaves, Susie says her class voted Calvin "Most likely to be seen on the news some day".

Calvin walks up to his bike asking if it would like some oil. Calvin jumps at the bike, saying it's going to the scrap heap. The two struggle. Mom is cleaning Calvin, who's all scarred and dirty. Dad says he never got his face caught in the chain when he was learning to ride a bike. Mom asks Calvin what really happened. Calvin insists he already told her.

In bed, Calvin says he hates his stupid bike. He's never going to ride one as long as he lives. He hears a creak. His bicycle comes out of his bedroom closet. Calvin shouts that the bike has been lying in wait and is coming to get him. He yells for help. Mom comes to his room and holds Calvin close. Calvin tells her that he told her it's trying to kill him. She says it was just a dream, but she asks why he brought his bike upstairs to his closet.

Mom asks Calvin to take a garbage bag to the garage. He asks if she's mad. He says that's where his killer bicycle is. He says it will jump him. Mom doesn't want any nonsense and sends him to take the garbage. In the garage, the bicycle is growling at Calvin. Calvin, back pressed against the wall, wonders how far from home his savings will get him.

Calvin whispers down to Hobbes from a tree branch. Calvin tells him he's hiding from his killer bicycle. He says it can't climb trees, so he'll have to stay there the rest of his life. Hobbes tells him to wedge a big stick through the spokes of the front wheel. He explains when the stick hits the fork, the wheel will jam and the bike will flip over. Calvin comes down calling Hobbes a lifesaver. Hobbes suggests they could mosey over to the kitchen if Calvin wonders how he could possibly thank him enough.

Calvin runs up to Hobbes telling him he put the stick in the bicycle's spokes. Calvin says when it tried to chase him, it flipped over. Calvin says he then wrestled it to exhaustion and let the air out of its tires. He says that nasty ol' thing won't be coming after him anymore. He says they're too smart for it. Mom notices Dad putting training wheels on Calvin's bicycle. Dad says he pumped up the tires. They were both flat.