| 0 | | | Exposed Foundations |
| | Zoe | Nolan | The girl who went missing in 2011. |
| | Kimberly | Nolan | Zoe's twin sister. Aka: Kim. |
| | Fintan | Murphy | Zoe's course mate and friend. |
| | Jai | Mahmood | Zoe's friend. |
| | Liu | Wai | Zoe's flat mate and friend. |
| | Andrew | Flowers | Zoe's boyfriend. |
| | Gaz/Trev | | The boy from the indie disco warehouse. |
| | Robert | Nolan | Zoe's father. Aka: Rob. |
| | Sally | Nolan | Zoe's mother. |
| | | | Part One Zoe Nolan Was Here |
| 1 | | | Separate Ways |
| | Michael | Anderson | Head of Vocal Studies. |
| 3 | | | Melting Pot |
| | Alex | Wilson | Zoe's flatmate. Aka: Al. |
| | Sam | Limmond | Alex's ex-boyfriend. |
| | Lois | Best | Zoe, Kim, and Liu's flat mate. |
| 4 | | | Dark Room |
| | Chihiro | | Kim's bonsai tree. |
| | Janine | Morris | Ex-student experience officer. |
| | Harry | Fowles | Andrew and Jai's flat mate. |
| | Mrs. | Withers | Nanny in Surrey. |
| | Alice | Hardy | Police Constable. |
| | Richard | Flowers | Andrew's father. |
| | Charles | Barclay | Andrew's grandfather. |
| | Élodie | | Andrew's ex-girlfriend. |
| 6 | | | Shadow Man |
| | Hannah | Docherty | Zoe's former tutor. |
| 7 | | | High Notes |
| | Vladimir | | Drug pusher. Aka: Vlad, Vlad the Inhaler. |
| | | | Part Two The Unusual Suspects |
| 10 | | | Half Midnight |
| | Sarah | Manning | Former detective constable. |
| | Connor | | Fintan's flat mate. |
| | John | Marber | Fire and Rescue Service Watch manager. |
| | Tariq | | Jai's friend. |
| | Gregory | James | Detective Inspector, Manchester Police. |
| 12 | | | Special Relationship |
| | | Lipson | Flowers' family lawyer. |
| 15 | | | Heart Attack |
| | Martin | Blackmore | Independent financial forensics analyst. |
| 16 | | | Unidentified Man |
| | Carys | Parry | Crimewatch former show producer. |
| | Patrick | | Fintan's father. |
| 18 | | | Scream Mask |
| | Dot | Sheldon | Cleaning lady. |
| 19 | | | Blood Red |
| | | Roberts | One of the constables. |
| 20 | | | Playing Zoe |
| | Alice | Ellis | Michael Anderson's ex-wife. Aka: Alice Anderson. |
| | Christopher | Anderson | Michael Anderson's grandfather. |
| | Louisa | | Alice and Michael's daughter. |
| 21 | | | Dead End |
| | Chloe | Matthews | The actor who played Zoe. |
| | | | Part Three Zoe Nolan Was Never Here |
| 23 | | | Comedy, Tragedy |
| | Henri | Caron | Jean Boivin's business associate. |
| | Jean | Boivin | Business tycoon. |
| | Juliette | Dupuis | Jean Boivin's wife. |
| | Victor | Bisset | French police. |
| | Jacques | Moreau | Prison guard. |
| | Anne | Moreau | Jacques' wife. |
| | Marie | Moreau | Jacques' mother. |
| | Gary | Matthews | Eldest of the Matthews brothers. |
| | Ricky | Payne | Property developer. |
| | Mike | | One of Gary's brothers. |
| | Kevin | | One of Gary's brothers. Aka: Kev. |
| | Lucille | Boivin | Jean Boivin's daughter. |
| | Elise | Pelletier | Foster care runaway. |
| | | | Part Four Friends Reunited |
| 24 | | | After Life |
| | Marcus | Lee | Former journalist. |
| | Emmy | Moss | Zoe's Angels alumna. |
| 27 | | | Showdown City |
| | Keith | | Andrew's boss. |
