Tosh was the story editor for the Doctor Who stories between The Time Meddler and The Massacre of St Bartholomew's Eve, working with producers Verity Lambert and John Wiles. On Tosh's final story, The Massacre of St Bartholomew's Eve by John Lucarotti, Tosh performed a substantial rewrite of the scripts, both to align them with historical accuracy and also to accommodate William Hartnell's dual role as both the Doctor and the Abbot of Amboise. On the final episode the story editor's credit was given over to his successor Gerry Davis and Tosh was co-credited.
He also performed an extensive re-write of The Celestial Toymaker by Brian Hayles. Most of this work, however, was in turn rewritten by Davis. Tosh claimed that the trilogic game was the sole retention from his version of the script.
In 2013 he appeared as an extra in An Adventure in Space and Time, a drama about the making of the William Hartnell era of Doctor Who, made to commemorate the show's 50th anniversary. The programme did not, however, depict a version of him as a character.
- Story Editor Donald Tosh
- Donald Tosh on Coronation Street and Doctor Who
- 'Script editing Who: interview with Donald Tosh', Doctor Who Magazine. No. 191