Jemma will play the role of Bernie (Bernice) Wolfe, a feisty general surgeon with battlefield experience. She will first appear as a patient on Darwin, before settling professionally on Keller.
Jemma said: "It will be great to be practising medicine again, on one of the BBC's flagship dramas. I am so happy to be joining the cast."
The daughter of late acting great Corin Redgrave, the esteemed theatre actress also has a vast background in TV acting, including medical dramas such as Bramwell and Frankie, and a long-running role in Doctor Who playing the head of the scientific research UNIT.
Oliver Kent, Holby City's executive producer Holby City, said: "When we dreamed up the character of Bernie Wolfe, we immediately thought of Jemma Redgrave and we were utterly thrilled when she agreed to join the Holby Company. Bernie Wolfe will be a force to be reckoned with and I can't wait to see her locking horns with our established regulars on the wards."
Jemma will begin filming on Holby later this month and her contract is for six months.
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