There are now many actors who have become household names. Many of these got their start or at least had a chance to guest star in Supernatural. Here are 15 you’ve possibly forgotten from over the years.

How many guest stars from Supernatural have now become household names? You’ll be surprised to hear that many actors, especially on TV shows, started out with guest star roles on the likes of Supernatural, Charmed, and Buffy the Vampire Slayer. This is a chance to look at back the ones that ran into Sam and Dean Winchester and have now made themselves known in households around the world.

Some of these are guest stars you may have overlooked or not realized at the time. Others you’ve known but didn’t realize this was where they started out. Some of these names didn’t quite get started on the series but did appear in the series before they became household names. However, most of them had the series as one of their first guest spots on TV before moving onto bigger things. Two of them are technically not guest stars, either, but series regulars who were in for a short period of time!

How many of these 15 guest stars do you remember from their time on Supernatural before they were famous? Don’t forget to let us know when you get through to the end.

Sterling K. Brown

Let’s start with good ole Gordon Walker. I remembered Sterling K. Brown in Army Wives before Supernatural. However, he came across the Winchesters first. In 2006, he took on the role of rogue hunter Gordon, who had lost a sister due to vampires and had a grudge against every single one of them. It didn’t matter if the vampires lived off animal blood or human blood. They were creatures and they needed to be killed.

This ended up with Gordon making an enemy of the Winchesters. Well, actually it was the other way around. Sam and Dean were willing to just forget about Gordon, but he was the one that kept showing up like a bad penny. Eventually, Gordon was taken down by the creature he hated the most: vampires. He became one and was killed by Sam.

Since his time on Supernatural, he became the only male “Army wife” in Army Wives. He was Roland Burton in the series, married to a high-ranking and determined female officer. As a psychiatrist, he helped many who came into the hospital and also treated a number of the officers and soldiers his wife knew—and spouses of his friends. He also helped deliver twins in the very first season.

He has since taken on the role of Randall Pearson, the child left at a fire station and adopted by the Pearsons, in This Is Us. This is the series he’s fully made himself a household name. We love seeing him as a good guy rather than a bad guy.

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.

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.

Lauren Cohan

The second and only other female to get a series regular credit on the series is Lauren Cohan and one of the earliest works was Supernatural. However, you’ll know her now in many other shows, including The Vampire Diaries and The Walking Dead. She has certainly become a household name since starting out with Jensen Ackles and Jared Padalecki.

Cohan was Bela Talbot in the series, a woman who has received mixed reviews from the fans. While she knew all about the supernatural creatures and lore, she used it for her own personal gain. She’d acquired artifacts to sell to the highest bidder. The only thing to stop her selling one on was by being affected by it in some way. This happened on two occasions in Supernatural Season 3.

Since starring in Supernatural, she’s moved onto bigger things. Her first was a guest star role in The Vampire Diaries, as Rose. She then moved onto Chuck, and then eventually onto The Walking Dead, where she’s played Maggie Greene and become a household name. She has also snapped up movie roles, playing Martha Wayne in Batman vs. Superman: Dawn of Justice.

While she hasn’t signed a contract for the ninth season, she is reportedly returning. However, she is also working on a midseason show for ABC called Whisky Cavalier. She is also in the movie Mile 22.

Cory Monteith

The late actor appeared in Supernatural Season 1. It’s one of those blink-and-you-miss-it moments in a way. In the second episode of the series, he was in the tent when the wendigo was outside ravaging the tent. He was one of the unfortunate victims. Why? Well, his character wasn’t attached to the main guest stars for the episode. Go figure!

Anyway, Cory Monteith went on to land a show of his own. Like you need any introduction to Finn in Glee. He was the football player who wanted to sing, even if joining the glee club meant being a geek.

Before Glee and after Supernatural, the Canadian actor also guest starred in an episode of Smallville and played Kahill in Final Destination 3 (you know, the one with the killer rollercoaster and tanning beds?) In 2007, he also landed the role of Charlie Tanner in Kyle XY and was Gunnar in 10 episodes of Kaya.

He had two projects after Glee, both released posthumously. Cory died on July 13, 2013 from a drug overdose. He’d suffered with addiction and mental health problems for a number of years and had received help before the accidental overdose. He was mourned by friends and fans, with a focus on his character’s off-screen death to give everyone a chance to publically grieve.