John Martin is detained when a sheriff demands his ID and he cannot produce it. He gets his freedom when his personality changes in prison.

John has summoned Mr. Boswell, Stanley's dad, to account for his son's continuous absence to class for five days. Boswell explains that the boy is afraid of crossing in front of the Crabtree mansion, an abandoned house that neighbors believe it to be haunted. John decides to find out who's behind the Crabtree ghost.

It is vaccination day at the school and John turns into a kid and he gets vaccinated. Then at the end of the episode, he becomes a man and the other teachers take him to get vaccinated again, much to his chagrin.