01
The story
The short version. Revenge, 40 episodes on YourChannel. Isabella looks like an ordinary factory worker riding the bus through Las Vegas. By chance she stops Martín, the youngest son of the wealthy De la Vega family, from being hit by a car.
The first episode lands on the bounty: Lorenzo de la Yera, Spain's wealthiest man, has issued a global appeal to save his eldest son Lucas, unconscious for more than seventy-two hours from an unknown illness. His little brother Martín runs through the street begging anyone for help, and nearly steps into traffic until Isabella pulls him back. Grateful and desperate, he promises her that if she saves Lucas, he will make his brother marry her. She agrees after one small thing: he had given her half a sandwich earlier, and kindness deserves to be repaid. She tells him to take her to the estate.
Episode six shifts to the street where Isabella grew up. Her old fiancé Raphael arrives with the eviction papers, boasting that he bought the building, that she owes him everything, and that he will tear the place down for a parking lot. He says dumping her was the smartest thing he ever did and that he is marrying Carmen next week. Isabella answers with her own standing: she is the majority shareholder of the tech park, a position Raphael never guessed belonged to the quiet factory girl.
Episode four brings Lucas back. The doctors report heart rate and oxygen levels normal, inflammation markers at zero, as if he had never been sick. The family's hired physician is dismissed for taking credit for a cure he could not explain, while the head of the family offers Isabella half the family fortune and Lucas's hand in marriage. She keeps the offer aside and says she asked for nothing in return. Martín tries to show her off to his brother, and the household cannot find her name or address before she slips away.
Series facts checked against the YourChannel listing. Notes cover the opening episodes only; nothing here reveals the ending.