Once their plot is foiled the villain (less often, a hero) will always get away in the most undignified and cowardly fashion imaginable. If they didn't, who would the hero fight next episode? This is probably why the heroes either don't even bother chasing them, or else send Red Shirts after them with predictable results, or even help them get away. Other times, they're just being sporting. No blockades, no manhunts, not even pursued by a bear. After all, it's at the end of the episode. Examples of Villain Exit Stage Left include: