| Jason Haynes | |
|---|---|
| Holby City character | |
 Jules Robertson as Jason Haynes | |
| First appearance | "A Partnership, Literally" 9 February 2016 |
| Last appearance | "Episode 1102" 29 March 2022 |
| Portrayed by | Jules Robertson |
| In-universe information | |
| Occupation | Porter (prev. Clinical audit assistant) |
| Family |
|
| Spouse | Greta Allinson (2018–) |
| Children | Guinevere Elinor Haynes (daughter) |
Jason Haynes is a fictional character from the BBC medical drama Holby City, played by Jules Robertson. He first appeared in the series eighteen episode "A Partnership, Literally", broadcast on 9 February 2016, and stayed until the show's final episode: "Episode 1102", which was broadcast on 29 March 2022. the Jason arrives at Holby City hospital to work as a porter after being introduced as the nephew of Consultant Serena Campbell (Catherine Russell). Robertson was cast after he impressed producers after auditioning against several other actors. Jason has Asperger syndrome and Robertson is the first non-neurotypical actor to play a non-neurotypical character in an ongoing role. Robertson has stated that his own experience with autism helped him portray Jason accurately. He is characterised as a nice man, who Robertson describes as "geeky and shy" and lacking a sense of humour.
Jason and Serena were unacquainted and it takes time for her to accept Jason into her family. Jason is transformed from a character who needed full-time care in supported accommodation to becoming an independent adult. Jason stories have focused on his connection with Serena and working as a hospital porter. Jason also involves himself in medical cases on the Acute admissions unit. Producers created a relationship with Greta Allinson (Zoe Croft), who also has Asperger syndrome. The pair become parents to Guinevere, which Serena was initially apprehensive about Jason's ability to cope. Jason also had a ruptured liver after being run over by his cousin Elinor Campbell (Amy McCallum).
Jason's inclusion in Holby City has prompted praise from autism charities such as the National Autistic Society and Ambitious about Autism. Rachael Sigee from the Evening Standard believed it was of the utmost importance that an autistic actor played the role. Juliet Rieden of The Australian Women's Weekly branded Jason a "breakthrough role" and a television first. The positive response to the character led him being developed into a long-term role.