In cinema and literature, a "sacrificial lamb" is a supporting character who's murdered by a villain, which prompts the protagonist to avenge them. The sacrificial lamb is often the protagonist's family member, partner, or friend. They can also be a defenceless stranger, such as an orphan. The virtuous hero mourns the sacrificial lamb's death, foiling the wicked villain who celebrates their enemy's defeat. The lamb's murder justifies the rivalry between the hero and the villain.