Netflix teen drama is wrapping up its story with this fourth and final season, after exploring the secrets of not only the late Hannah Baker, but also the other students at Liberty High School.

Originally developed as a limited series by show creator Brian Yorkey, 13 Reasons Why season 1 was more or less a direct adaptation of Jay Asher's book of the same name, which was structured around thirteen tapes left behind by teenager Hannah Baker (Katherine Langford) after her suicide. Due to an explosion in popularity (which also came with some controversy), Netflix decided to renew the show for season 2, which was followed by two further season renewals.

Related: 13 Reasons Why: Where Season 3 Went Wrong

Since 13 Reasons Why's debut in 2017, several of the young cast have gone on to bigger things. Langford starred in the movies Love, Simon and cut from the theatrical version). Meanwhile, Dylan Minnette has seen his music career flourish, with his band Wallows g a deal with Atlantic Records in 2018. While Hannah Baker is unlikely to return for 13 Reasons Why season 4, after bowing out at the end of season 2, the series is adding some new faces in season 4.

Gary Sinise as Dr. Robert Ellman

13 Reasons Why Season 4 Gary Sinise

In CSI: NY, and George Milton in the 1992 adaptation of Of Mice and Men.

Jan Luis Castellanos as Diego Torres

13 Reasons Why Jan Luis Castellanos Diego

The football team is determined to find out the truth about Monty in Runaways.

13 Reasons Why's Returning Cast

13 Reasons Why Clay Season 4
  • Dylan Minnette as Clay Jensen - The protagonist of 13 Reasons Why, who is now struggling to deal with yet another classmate's death.
  • Alisha Boe as Jessica Davis - Hannah Baker's former friend, and one of the real culprits behind Bryce Walker's death.
  • Ross Butler as Zach Dempsey - A former member of the football team who brutally beat Bryce Walker before his death.
  • Brandon Flynn as Justin Foley - Clay's former enemy, who is now his friend and recently adopted brother.
  • Davin Druid as Tyler Down - Liberty High's resident photography enthusiast and stalker.
  • Miles Heizer as Alex Standall - Jessica's ex-boyfriend, and the person most directly responsible for Bryce Walker's death.
  • Grace Saif as Ani Achola - Clay's girlfriend, who framed Monty for Bryce's murder in order to protect Alex.
  • Deaken Bluman as Winston Williams - Monty's former lover, who knows that Ani framed him for Bryce's murder.
  • Austin Aaron as Luke Holliday - A jock and bully at Liberty High who hooks people up with steroids.
  • Christian Navarro as Tony Padilla - One of the kindest students at Liberty High. Tony's family was deported in season 3.
  • Tyler Barnhardt as Charlie St. George - A sophomore who helped frame Monty for Bryce's murder.
  • Justin Prentice as Bryce Walker - A jock, bully, and rapist at Liberty High whose murder was the big mystery of season 3.
  • Timothy Granaderas as Monty de la Cruz - A jock who was framed for Bryce's murder and then killed in his jail cell.

More: 13 Reasons Why Season 3's Ending Explained