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Previously seen in: Prison Break, Lost, Saving Grace, Scandal
Dylan Minnette, who appears as Clay Jensen in 13 Reasons Why, made his on-screen debut in one 2005 episode of Drake & Josh, going on to play a young version of Michael Scofield in Prison Break, Jack and Juliet's son David Shephard in Lost, Clay Norman in Saving Grace, and First Son Jerry Grant Jr. on Scandal.
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Previously seen in: Blue Bloods, The Affair, Vinyl
Christian Navarro joined 13 Reasons Why as Tony, a role he took on 10 years after making his first TV appearance in a 2007 episode of Law & Order: Criminal Intent. The actor earned credits as a police officer in a 2013 episode of Blue Bloods, as Jed on The Affair, and as Jorge in an arc on Vinyl.
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Previously seen in: Louie, Olive Kitteridge, House of Cards
13 Reasons Why fans know Devin Druid as Tyler, a gig the young actor booked three years after making his small-screen debut. Druid previously played a young Louie in Louie, a young Christopher in Olive Kitteridge, and Danny in one 2016 episode of House of Cards.
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Previously seen in: Days of Our Lives, Casual, CSI: Cyber, Ray Donovan, Teen Wolf, Trophy Wife
Alisha Boe racked up small-screen projects before joining 13 Reasons Why as Jessica. The rising star previously played Daphne in Days of Our Lives, Becca in Casual, Grace Clarke in CSI: Cyber, Janet in Ray Donovan, Gwen in Teen Wolf, and Chelsea Trassen in the Trophy Wife pilot.
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Previously seen in: BrainDead
Brandon Flynn made his on-screen debut just months before appearing in 13 Reasons Why as Justin. Flynn's previous credit is for a 2016 episode of BrainDead, in which he played Mike the Intern.
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Previously seen in: Chasing Life, K.C. Undercover, Teen Wolf, Riverdale
It's been a big year for Ross Butler, who plays Zach in 13 Reasons Why — the actor is also starring in Riverdale as Reggie Mantle. Butler's other previous credits include turns as Hunter in Chasing Life, Brett in K.C. Undercover, and Nathan in Teen Wolf.
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After appearing in one short, Katherine Langford makes her on-screen debut in 13 Reasons Why. The newcomer leads the talked-about series as Hannah Baker. She will reteam with costar Miles Heizer for the upcoming movie Simon vs. The Homo Sapiens Agenda.