Taylor Kinney

You may know him better as charismatic firefighter Kelly Severide from NBC's procedural drama Chicago Fire, but long before that, Kinney made an appearance as Mason Lockwood, Tyler's werewolf uncle.

Although his part wasn't quite as large, his charm still shined through.

Hayley Kiyoko

Despite her blossoming music career, Hayley was also trying to make her way as an actress. Her role in The Vampire Diaries is very small as she portrays Megan King, Caroline and Elena's college roommate who is killed by a vampire.

Rick Cosnett

The Flash star had more luck and landed the role of Wes Maxfield, a professor at Whitmore College with a slight obsession with scientific experiments involving vampires.

Not only was it a more prominent role compared to the other actors on this list, but it was also a strong antagonist arc.

Mckenna Grace

This young Hollywood actress was cast in The Vampire Diaries at the tender age of 9 to play the younger version of Caroline Forbes. Although she only appeared in two episodes, the actress made quite an impression.

Stephen Amell

Another Arrowverse actor you may have missed on The Vampire Diaries is Green Arrow himself.

He portrayed a werewolf named Brady who ended up dead as one of Damon Salvatore's many victims.