This episode introduces the concept of the "Originals," the very first vampires. Rose explains that they are incredibly powerful and, as Stefan and Damon soon discover, nearly impossible to kill with standard methods.
Making his first appearance, Elijah demonstrates the terrifying speed and strength of an Original. His presence raises the stakes of the series significantly, as he easily overpowers the Salvatore brothers. [S2E8] Rose
The episode concludes with a vulnerable moment where Damon confesses his love to Elena but uses compulsion to make her forget, choosing to be "selfless" for once. This episode introduces the concept of the "Originals,"