Alfalfa's weird aunt Penelope pays a visit. She's working on a murder mystery novel, but Alfalfa thinks she's trying to murder him. It's up to the Spanky and the gang to save him.
It's Mr. Hood's birthday and he's looking forward to a quiet celebration with his family. But Darla's friends show up with living presents, eat his dinner, argue about Tarzan and Alfalfa croons a special song for the unhappy man.
Spanky and Alfalfa plot to play hooky so they can go fishing, by pretending that Alfalfa is sick and Spanky should stay with him while the parents are away. But Spanky's mom, knowing the truth, turns the tables by insisting they also watch Spanky's little brother. But taking care of little brother turns out to be more difficult than they expected.