While at a discount store one day, Mr. Krabs finishes up purchasing multiple items. On his way out of the store, Mr. Krabs spots SpongeBob picking something up. Mr. Krabs realizes he picked up a penny off the ground. Mr. Krabs starts to remember SpongeBob picking up the penny until the store clerk tells him he is holding up the line.
On his way home, he starts complaining how SpongeBob got a free penny, while other people have to work for one. So he decides to to calm himself down, but every time he sees something circular, he keeps having visions of pennies, and becomes obsessed of having the penny. The next day at work, he asks SpongeBob if he found anything special, and if he can share it with him, only for SpongeBob to reply that he found a brand new day, not a penny. Once SpongeBob goes into the kitchen, Mr. Krabs asks if he can barrow a penny. SpongeBob says that he doesn't have one. So Mr. Krabs makes SpongeBob check all of his pockets, and shaking him upside down but instead gets SpongeBob's brain out, causing his brain to crawl away. So Mr. Krabs and SpongeBob chases his brain until SpongeBob is able to capture it.
Later SpongeBob and Squidward hear loud noises, so they go and check what it is, only to see Mr. Krabs is building a theater behind the Krusty Krab. Mr. Krabs opens up the movie theater, and he makes admission a penny, so he will get SpongeBob's penny, but he does not have one, so in frustration, he destroys the theater. Later that night, SpongeBob returns to the Krusty Krab, only to be surprised that Squidward is all fancy for the Krusty Krab Semi-Annual Charity Night, a show put on by Mr. Krabs. He goes to his table and Mr. Krabs starts the show. The show, Pennies for the Penny-less, shows how he does not have a penny. Mr. Krabs says that SpongeBob can end this travesty by donating one penny to him, but SpongeBob still does not have one, so Mr. Krabs breaks.
Later that night, Mr. Krabs spies on SpongeBob as he leaves his house. He breaks into SpongeBob's house with a metal detector to find the penny. SpongeBob comes in and sees Mr. Krabs. Mr. Krabs then explains how he wanted the penny SpongeBob found on the ground and says sorry. SpongeBob shows him it was not a penny, but a dried up piece of gum, for his gum collection. Mr. Krabs leaves and SpongeBob discovers that it is a five hundred dollar bill. Meanwhile, Mr. Krabs is still digging for the penny, all over Bikini Bottom.
The cashier said to Mr. Krabs that his coupons expired over thirty years ago, which means that Mr. Krabs is over 30 years old.
The plot is similar to "One Krabs Trash" because, in both episodes, Mr. Krabs really wants something that SpongeBob has.
It's revealed that SpongeBob is a brain whisperer in this episode.
Mr. Krabs opens a theater right behind the Krusty Krab and a single movie inside.
The movie posters that Krabs had on the wall of the movie theater were "Love," "Scary," "Buddies," "Hero," and "Kids."
Running Gag: When Mr. Krabs is seen from a distance, people hear dolphin chirps. A boy in the boat with his mother, and two people listening to Mr. Krabs announce the new theater.
During the Krusty Krab semi-annual charity night, it's unknown how Squidward got up to shine a flash light on Mr. Krabs.
This is the third out of the five times Mr. Krabs goes crazy just to get one penny. The first was in "Culture Shock" when he smells a penny on a table and he took off like a rocket destroying the table. The second was in "Born Again Krabs" where he almost tore a customer's arm off for one. The third was in "Imitation Krabs" where he chased a penny down the street leaving the Krusty Krab nearly unguarded. And the fifth time was in "Face Freeze!" where he tossed away a customer and messed up someone's Krabby Patty while looking for a penny.
Unlike all those others episodes, this episodes involves Mr. Krabs going crazy for a penny for the almost the entire episode.