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The Doctor Who actor will play villain Pomfrey in The Legend of Fritton's Gold, while Girls Aloud singer Sarah Harding has also been confirmed as a "cool new schoolgirl" in the sequel, the BBC reports.
They will join Colin Firth, Rupert Everett and Ashes To Ashes star Montserrat Lombard in the follow-up to the 2007 update of the 1950s series.
Harding, who appeared in a cameo role in the first movie, recently said that there is a "stigma" associated with musicians who attempt to move into acting.
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