Instead of telling a newly diagnosed 5-year-old son that he has Leukaemia; Brian tells Arthur that the chemotherapy will give him superpowers. In a battle to keep them both positive, Brian is haunted by his lie as he struggles to find hope
| Actor | Role |
|---|---|
| PPierre-Laurent VawahArthur | Arthur |
 Michael SalamiBrian | Brian |
| NNiamh LewisPenny | Penny |
 Alex WaltonPatrick | Patrick |
| OOxa HazelNurse Kacey | Nurse Kacey |
| SSolomon FamosaTommy | Tommy |
| CCharlotte LynchNurse Charlotte | Nurse Charlotte |
| JJordan "Jords" WilksNurse Jordan | Nurse Jordan |
| FFreyja NewmanChild Extra | Child Extra |
| LLorcan Baixi DoyleChild Extra | Child Extra |