Before Grant Gustin was The Flash, he was singing his heart out on Glee.
Candice Patton? She had roles on The Young and the Restless, The Bold and The Beautiful, and even Grey's Anatomy.
Take a look below to find out what your favorite cast members were up to before they were on The Flash.
Grant Gustin, Then...
Before Grant Gustin was Barry Allen, he was Sebastian Smythe on Glee. He also appeared on several episodes of The CW's 90210, and one episode of CSI: Miami.
Grant Gustin, Now...
Grant Gustin gave up his singing career to be a superhero, and you can now catch him as the lead character on The Flash.
Candace Patton, Then...
Before she was Iris West, Candace Patton had roles on The Young and the Restless, The Bold and the Beautiful, Entourage, and Heroes, among many others. She even appeared on one episode of Grey's Anatomy.
Candace Patton, Now...
Now, Candace Patton plays the important role of Iris West, who is also Barry's best friend, on The Flash.
Danielle Panabaker, Then...
Daniella Panabaker had several television appearances before starring on The Flash. In addition to her role on the mini-series, Empire Falls, she appeared on such shows as Summerland, Grey's Anatomy, Bones, and Malcom in the Middle.
Danielle Panabaker, Now...
Now, Danielle Panabaker is best known for her role as the incredibly intelligent Caitlin Snow on The Flash.
Rick Cosnett, Then...
Rick Cosnett was hanging around The CW before his role on The Flash. He played Dr. Wes Maxfield on The Vampire Diaries. He's also known for his role on the 2006 fil, The Bet.
Rick Cosnett, Now...
Now, Rick Cosnett stars on The Flash the partner to detective Joe West, Eddie Thawne.
Carlos Valdes, Then...
Before he was on The Flash, Carlos Valdes focused his energy on the theater. He participated in productions like High School Musical, The Wedding Singer, and Once.
Carlos Valdes, Now...
Now, Carlos Valdes is Cisco Ramon, the youngest scientist at S.T.A.R. Labs on The Flash.
Tom Cavanagh, Then...
Before he was on The Flash, Tom Cavanagh was best known as Ed Stevens on the TV series, Ed. He also appeared on several episodes of Scrubs and Royal Pains.
Tom Cavanagh, Now...
And now, Tom Cavanagh is known for two roles on The Flash, as both Dr. Harrison Wells and the Reverse-Flash. Quite a change, yes?
Keiynan Lonsdale, Then...
Keiynan Lonsdale is best known for his role as Oliver Lloyd on the series Dance Academy. He also played the role of Uriah Pedrad in The Divergent Series: Insurgent.
Keiynan Lonsdale, Now
Now, Keiynan Lonsdale plays Wally West, the son of Joe West and brother of Iris, on The Flash.
Patrick Sabongui, Then..
Before arriving to The Flash, Patrick Sabangui had appearances on several films and television shows, including The 100, Stargate: Atlantis, 24, Fringe, and Psyche.
Patrick Sabongui, Now...
And now, Patrick Sabongui is known for his role as David Singh, director of the crime lab, on The Flash.
Teddy Sears, Then...
Remember the TNT series Raising the Bar? Before Teddy Sears was on The Flash, he played Richard Patrick Woolsley on the legal drama. Sears has also appeared on Mad Men, American Horror Story, and Blue Bloods. Most recently, he was Dr. Austin Langham on the Showtime series, Masters of Sex.
Teddy Sears, Now...
Now, Teddy Seas is known for his role as Jay Garrick, a.k.a. Zoom on The Flash. He looks great in that hat, right?
Jesse L. Martin, Then...
Jesse L. Martin is best known for his role as Tom Collins on the musical Rent and as NYPD Detective Ed Green on Law & Order.
Jesse L. Martin, Now...
Now, Jesse L. Martin plays the father of Iris West and father figure to Barry Allen as Detective Joe West on The Flash.
Shantel VanSanten, Then...
Shantel VanSanten is no stranger to The CW. Before she joined the cast of The Flash, she was known for her role as Quinn James on One Tree Hill.
Shantel VanSanten, Now...
Shantel VanSanten then went on to play Vera on The CW's short-lived drama, The Messengers, joining the cast of The Flash as Patty Spivot shortly after. Patty has already left the show, and VanSanten apparently has a TV movie in the works.