A 300-pound safe drops on Herman’s head, causing him to develop amnesia. In order to get him released into her custody, Lily petitions the court to adopt Herman as her son. Until he restores his memory, he is treated as Eddie’s brother John.

When Eddie reads a school composition entitled “My Parents – An Average American Family” to his class, his teacher believes the boy is exhibiting symptoms of an overactive imagination. The school principal suggests that Eddie’s wild exaggerations might be motivated by an underprivileged home life. It is decided that a visit to the Munster home is in order.