6. Aaron Ashmore
While his twin brother Shawn was appearing on the big screen as Iceman in the X-Men films, Aaron Ashmore made his home on the small screen as Jimmy Olsen in the WB's Smallville. Though Shawn's role garnered him more attention Aaron refused to slow down with starring roles in Veronica Mars, Warehouse 13, and Lost Girl. What many may not know is that Aaron received a bit of a head start in acting having appeared in the episode "The Tale of the 13th Floor" in 1993. Playing - of all things - a twin brother to the female protagonist, Aaron's character visits the abandoned thirteenth floor of their apartment building only to discover it has some new, quirky residents. It turns out that the twins aren't as related as they believe in an amusing twist. Aaron later went on to star in another episode during the short revival in 1999, "The Tale of the Lunar Locusts" this time appearing alongside the massively popular Tara Lipinski. Aaron continues to play on Syfy's original series, "Warehouse 13" and his character has garnered a great deal of positive attention when the character was revealed to be gay. No matter whom Aaron is playing he has proven he has the skill to pull off the performance and can thank Are You Afraid of the Dark for giving him his start.