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Dylan has starred in Scandal, Goosebumps, Agents of S. Chelsea will play Cyrus's sister, Mackenzie, who is described as "an artsy and witty girl who isn't afraid to speak her mind".
Allison Miller has joined the cast as Sonya, "smart and ambitious" litigator, working on the Baker family's lawsuit against Liberty High School.
Before 13 Reasons Why, Christian also appeared in TV series Vinyl and The Affair. Anne has starred in a number of American TV shows including drama series Tyrant as Emma Al-Fayeed, and crime drama series Wicked City as Vicki Roth.
Dylan plays shy high school student, Clay Jenson, who receives a mysterious package in the post containing seven of the cassette tapes recorded by Hannah. She won a Daytime Emmy award for her role in Zac and Mia.
Here's the cast who have helped make the show such a success and five new additions for the second instalment.
Katherine is an Aussie actress who plays Hannah Baker, the young woman who takes her own life, in the hit TV series. Alisha Boe, Brandon Flynn, Justin Prentice and Miles Heizer also star in the hit Netflix show.