Guest Stars Ncuti Gatwa as Eric Effiong Emma Mackey as Maeve Wiley Connor Swindells as Adam Groff 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 Reda Elazouar as Beau Alexandra James as Aisha Lisa McGrillis as Joanna Daniel Ings as Dan Anthony Lexa as Abbi Montgomery Felix Mufti as Roman Dan Levy as Thomas Molloy Marie Reuther as Ellen Rasmussen Shak Benjamin as Adedeyo Imani Yahshua as Tyrone 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 Mona Goodwin as Geri Imman Zaffrani as Haya Matthews Geoff Berrisford as Dave Laura Evelyn as Amelia