1: Remember the iconic characters from The Originals who crossed over to The Vampire Diaries universe?

2: Freya Mikaelson, played by Riley Voelkel, made several appearances in Mystic Falls.

3: Rebekah and Kol Mikaelson also appeared in The Vampire Diaries, delighting fans.

4: Esther and Mikael, the Mikaelson parents, appeared in flashback scenes.

5: Tyler Lockwood had a tense encounter with Klaus Mikaelson in season three.

6: Lexi Branson, Stefan's best friend, crossed paths with Klaus in a memorable episode.

7: Nadia Petrova, Katherine's daughter, made an impactful appearance in The Originals.

8: Kai Parker, the villainous witch, caused chaos in both series with his cunning schemes.

9: These crossovers added depth and excitement to both The Originals and The Vampire Diaries universes.