Zosia received a puppy for her birthday. Much to Zosia's delight, the dog grows rapidly, causing the Mordziaks distress. To them, it's a large, dangerous giant. However, the kindhearted creatures overcome their fear and save the puppy at a critical moment. In gratitude, the dog protects them from a cat attack. Uncle Jeremi reads the Mordziaks a book about the adventures of Staś and Nel. Episode 3 from the Mordziaki series.