Ernest and Kathy love to listen to Professor Spiegelmacher's radio program, 'Feeling Good Without Loot'. Frisby believes the professor's philosophy is lunacy, but manages to get himself trapped into booking the professor as an emergency replacement for an Mrs. Clanish's lecture series - a task that he delegates to the reluctant Ernest. With the help of Johnny Jupiter, Ernest meets the Professor, who agrees to speak. When the professor arrives at the auditorium, Ernest and Kathy learn that their hero cares far more about money than he lets on.
While Kathy plan a surprise birthday party for her father, Mr. Frisby tries to teach Ernest the proper way to 'hard sell' a customer, a technique that meets with disaster - so much so that Ernest gets fired from his job. With the help of his friends on Jupiter, Ernest develops a sales approach that appeals to his customers' soft spot and manages to sell merchandise that had sat on Mr. Frisby's shelves for years. Frisby hires him back with a bonus and Ernest promptly spends it on a birthday present for Mr. Frisby.
When Ernest takes a break from working on a difficult correspondence school exam, Reject the Robot takes pity on him and fixes all his incorrect answers. When Duckweather receives the results of the exam, his boss, Mr. Frisby thinks he has a genius working for him.
At Kathy's urging, Ernest sets out on his own and after consulting with Johnny Jupiter, decides to open a TV repair shop. His first customer is the owner of the local newspaper and Ernest soon has the set repaired thanks to Robbie the Rejects assistance. Unfortunately, Johnny notices that Robbie has tuned it to receive a television program from Jupiter that evening and Ernest must fix the set before the appointed hour.
Ernest decides to show the Jovians what he does with his spare time and invites Reject the Robot to go with him to a penny arcade. When Reject falls head-over-heels in love, Ernest can't convince him that the object of his desire is a mannequin.