How do you know this man? Do you think you might have seen him on your TV screen? Then you're probably right.

If you don't know Nathan Fillion you may have been living under a rock. He starred as Richard Castle on Castle for eight seasons, but you also may have stumbled upon him on Desperate Housewives, Modern Family, or Community. How about Santa Clarita Diet where his decapitated head plays a major role? Captain Hammer? Captain Mal Reynolds? The evil Caleb from Buffy the Vampire Slayer? Or perhaps all the way back to his days as Joey Buchanan on One Life to Live. The list goes on and on, so the odds are good that you’ve seen Fillion somewhere, in something before now.

Where have you seen Afton Williamson before The Rookie?

I became a fan of Afton Williamson’s after her guest stint on Bull Season 2 Episode 15, but maybe you caught her as FBI Agent Katie Myers on Shades of Blue Season 3, as Alison Medding on Banshee, or Makena on Nashville. Even if you haven’t seen her before you’ll definitely want to check her out on The Rookie.

Do you know Eric Winter?

Eric Winter was most recently seen as Adrian Webb on Rosewood and Neil Oliver on Secrets and Lies, but my two favorite roles of Eric's were Craig O’Laughlin (Grace’s fiancee and Red John's minion) on The Mentalist and Rex Brady on Days of Our Lives.

If you haven't seen her act, maybe you've heard her sing...

If you were a fan of Canadian Idol you may remember Melissa O'Neill as the show’s youngest and first female winner! Elsewhere on TV you may have caught her playing Janice on Condor, Suki on iZombie, and Two on Dark Matter. But you definitely won't want to miss her as Officer Lucy Chen on The Rookie.

The odds are, you've seen Richard T. Jones on your TV before...

I’ve been a fan of Richard T. Jones going all the way back to him playing Bruce Van Exel on Judging Amy, but if you think you may have seen him on your screen more recently, it could have been as Rick on Santa Clarita Diet, Detective Tommy Cavanaugh on Wisdom of the Crowd, Officer Lionel Wilkins on Criminal Minds, or Agent DEA on Narcos.

From where do you know Alyssa Diaz?

If you’re a soap fan you might remember Alyssa Diaz as Celia Ortega on As the World Turns. She was also seen as Kim on The Vampire Diaries, Gloria on Army Wives, Dariela Marzan on Zoo, and Teresa on Ray Donovan. Now she's training Officer Angela Lopez on The Rookie.

Does Titus Makin Jr. look familiar?

Perhaps you recall Titus as David on Glee or Lukas Parnell on Star-Crossed. Maybe it’s as Clark Wilkins from Pretty Little Liars or from his roles on Millennials: The Musical. Between Titus and Melissa O’Neil’s there appears to be enough singing talent to produce a musical episode for The Rookie!

Has this woman already graced your TV?

Did you first find Mercedes Mason as Isabel Zambada on The Finder? Maybe it was as Louise Leonard on the short-lived 666 Park Avenue or as DEA Agent Talia Del Campo on NCIS: Los Angeles. And for those who don’t fear a zombie horde, you may have watched her as Ofelia Salazar on Fear the Walking Dead. Here on The Rookie she's the Captain calling the shots.