Guest Stars Ncuti Gatwa as Eric Effiong Connor Swindells as Adam Groff Emma Mackey as Maeve Wiley Aimee Lou Wood as Aimee Gibbs Kedar Williams Stirling as Jackson Marchetti Alistair Petrie as Headmaster Michael Groff Mimi Keene as Ruby Matthews Samantha Spiro as Maureen Groff Chinenye Ezeudu as Viv Odusanya George Robinson as Isaac Goodwin Dua Saleh as Cal Bowman Doreene Blackstock as Beatrice Effiong George Somner as Joe Thaddea Graham as Sarah "O" Owen Alexandra James as Aisha Reda Elazouar as Beau Daniel Ings as Dan Lisa McGrillis as Joanna Felix Mufti as Roman Anthony Lexa as Abbi Montgomery Dan Levy as Thomas Molloy Marie Reuther as Ellen Rasmussen Imani Yahshua as Tyrone Shak Benjamin as Adedeyo Andi Osho as Nicky Bowman Juliette Alexandra as PK Anil Desai as Dr. Hunt Dolly Gadsdon as Darla David Layde as Roland Matthews Gia Rose Patel as Young Ruby Serranna Su-Ling Bliss as Young Sarah Laura Evelyn as Amelia Mona Goodwin as Geri Geoff Berrisford as Dave Imman Zaffrani as Haya Matthews