15 guest stars on Supernatural before they were famous

"Death's Door" - (L-R): Jensen Ackles as Dean Winchester and Jared Padalecki as Sam Winchester in SUPERNATURAL on The CW.Photo: Michael Courtney/The CW©2011 The CW Network, LLC. All Rights Reserved.
"Death's Door" - (L-R): Jensen Ackles as Dean Winchester and Jared Padalecki as Sam Winchester in SUPERNATURAL on The CW.Photo: Michael Courtney/The CW©2011 The CW Network, LLC. All Rights Reserved. /
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Arrow — “Present Tense” — Image Number: AR804b_0145b.jpg — Pictured: Katie Cassidy as Laurel Lance/Black Siren — Photo: Jack Rowand/The CW — © 2019 The CW Network, LLC. All Rights Reserved.
Arrow — “Present Tense” — Image Number: AR804b_0145b.jpg — Pictured: Katie Cassidy as Laurel Lance/Black Siren — Photo: Jack Rowand/The CW — © 2019 The CW Network, LLC. All Rights Reserved. /

#14. Katie Cassidy

Katie Cassidy is best known for her role of Laurel Lance in Arrow now, but she got her start in Supernatural. Sure, she’d had small roles before her time on the series but it was as the demon Ruby that she helped to get her name out there.

More from Supernatural

Ruby was the demon we weren’t sure whether we could trust or not. She suddenly showed up in Supernatural Season 3 (becoming the first of only two females to get series regular credit in the series) killing demons and offering Sam help. She promised to save Dean from Hell, only to later make it clear that she couldn’t help after all. After the third season finale, Cassidy left the role and Genevieve Cortese Padalecki took on the role.

However, Cassidy went onto Harper’s Island, which would also star Supernatural guest star Jim Beaver. She would also guest star in Melrose Place, Gossip Girl, and New Girl, as well as landing one of the lead roles in the A Nightmare on Elm Street reboot attempt.

It’s Arrow where she’s become a household name—and she now films just next door to her old filming location. She’s Laurel Lance/Black Canary/Black Siren in the series and has also shown up in Legends of Tomorrow and The Flash.