Prudence's pet rooster learns to crow but won't stop doing it in the middle of the night. The family tries various remedies. Nanny sits up with him one night. The Professor tries putting a cardboard box over him in his coop, but Sebastian gets away and Daddy ends up chasing him through the neighborhood in the middle of the night only to be confronted by the police. Sebastian is brought home but he still won't stop crowing during the night, so Hal tries one of his inventions but it ends up giving Sebastian a hefty electric shock. Nanny comes to believe that Sebastian is after a mate, and the Professor is left to try to explain that facts of life to Prudence to get her to let him send Sebastian to a farm to "have his pick of lady chickens." Of course, Sebastian doesn't stay there.
What this show did best was handle situations any family might handle, just with a touch of mysterious help from a surprise Nanny. This episode dealt with a pet growing up and having to be given away, and how a father explains the facts of life to his five-year-old daughter and convinces her it is her decision to make but she should make the right one. Kim Richards was awfully good in this show and especially this episode - for heaven's sake she was only five years old but she could believably pull off the broken-hearted child having to make a very tough decision about a pet she loved.