Spoiler alert: The following section contains plot-specific details.(Skip Section)
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The episode starts with Kirby, Tiff, Tuff, Iro, Spikehead, and Honey relaxing by the beach, when all of a sudden, it gets cold. Thinking the cause of the sudden chill is an ice monster, they go to King Dedede's Castle to see if he purchased any of them. He shows them a bill that says that he can't order anymore monsters until he pays his bill, so Tiff, Tuff, and Kirby decide to investigate outside. All the Cappies go with them, and they all discover an iceberg, and with it, a penguin clan called Pengi. They state that when they came when the village started to snow. Mayor Len Blustergas and the other Cappies hold a celebration for the Pengi, but Tiff, Tuff, and Kirby investigate the iceberg. Kirby soon finds a way inside the iceberg to a giant air conditioner so large, it froze Cappy Town. The trio is caught by the Pengi soon after discovering this air conditioner. They are held hostage and the Pengi freeze everyone with their ice breath. The Pengi say they don't like to wander because they want to find somewhere cold to live, and that their first home was destroyed. They invade the village and the castle and make Dedede and Escargoon do intensive labor, so Tiff, Tuff, and Kirby devise a plan. They tell a Pengi that they need to use the bathroom- they used this opportunity to get out of the castle by dressing as a Pengi. They meet up with a Pengi guard, but it was actually Meta Knight in disguise. While Dedede and Escargoon talk about being happy that Kirby is in their lives, they are freed from their intensive labour. Then, they ambush the Pengi leader. Kirby inhales his ice breath, becomes Ice Kirby, and fights him. However, in an attempt to freeze the Pengi leader, it is found that ice benefits the Pengi, so Dedede tries ordering a fire monster. Instead he gets a hot sauce called Volcanon. Tiff calls for the Warp Star and tells Kirby to take the Volcanon to the Booma-Dooma Volcano. He does so and pours the hot sauce in the volcano while humming a merry tune, and it erupts, melting all the snow. The Pengi leave Cappy Town and the warm weather returns. When Dedede and Escargoon use lots of air conditioning machines, Tiff, Tuff, and Kirby short-circuit out their machines, saying that they should conserve energy. The episode ends with Kirby jumping into a small tub of water.
Changes in the dub
The notice from Nightmare Enterprises is more detailed in the Japanese dub; the Japanese version features a notice saying "To DeDeDe" and the unpaid balance of 2,943,250,000 deden. It is also signed by "Holy Nightmare Co." In the dubbed version, it only says "Notice" and the text is replaced by lines (which is common in letters in many cartoons).
Tiff says that she has never seen a penguin in person, but if King Dedede is a penguin (it is not confirmed but it can be assumed he is), this statement is false.
It can be assumed that after the events of this episode, King Dedede pays the bill.