Lucian Msamati (pictured right) was recently on set at the BBC One drama playing Joseph Segunle, a character who practises live blood testing as an alternative medicine.
Well-known for playing JLB Matekoni in The No. 1 Ladies Detective Agency, Msamati has also had roles in Game of Thrones and Ashes to Ashes.
Meanwhile, former Dinnerladies and Coronation Street star Andrew Dunn has also filmed a guest spot on the programme, playing a cross-dressing truck driver named Dennis who has cancer.
All does not go well when Dennis shares the news about his health with his estranged family…
Doctors airs weekdays at 1.45pm on BBC One, and the episodes in question are expected to air next year.