Rishi has landed the role of Jas Khella, who secures a job at The Mill following a successful interview in an upcoming episode.
With Howard and Heston quizzing candidates, they are disappointed when the answers they receive are identically bland - which makes it difficult to differentiate between the applicants.
However, when Jas turns up, her honest replies are refreshing and she immediately becomes Howard's top choice. As Heston concurs, Jas is overjoyed with her success.
Jas's only disappointment is that the role is a part-time one. Struggling with her finances, she is in desperate need of something more permanent.
Viewers will also learn that Jas already knows established character Kevin Tyler (Simon Rivers), as they were friends at medical school.
Impressed by Jas's hard work on her first day and knowing that she needs some help, Kevin agrees that she can stay at his place for a while until she sorts out her financial situation. Will Jas fare well at The Mill?
Doctors airs Jas's first scenes on Tuesday, August 21 at 1.45pm on BBC One.
> Read Digital Spy's full spoilers for upcoming 'Doctors' episodes