Tamm returned as Pandora in the second series of the Gallifrey audio plays produced by Big Finish Productions.
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After leaving the series, Tamm took leading roles in two BBC 1 dramas, The Treachery Game (1980) and its sequel The Assassination Run (1981) alongside Malcolm Stoddard.
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It opened at London's Vaudeville Theatre on 9 December 1981 with Gordon Jackson as Superintendent Battle and a cast that included Derek Waring, Belinda Carroll, Mary Tamm and Patricia Driscoll.