Graham is joined by singer Mariah Carey, TV chef Nadiya Hussain, astronaut Tim Peake, Pointless presenter Richard Osman and singer-songwriter Gary Barlow, who chats and performs Incredible.
| Name | Type | Role | |
|---|---|---|---|
| Gary Barlow | Musical Guest | ||
| Nadiya Hussain | Guest Star | ||
| Tim Peake | Guest Star | ||
| Richard Osman | Guest Star | ||
| Mariah Carey | Guest Star |