You may wish to consult Conversion (disambiguation) for other, similarly-named pages.

Conversion was the two-part story comprising part of the two hundred and fifty eighth release in Big Finish's monthly range. It was written by Guy Adams and featured Peter Davison as the Fifth Doctor, Sarah Sutton as Nyssa, Janet Fielding as Tegan and George Watkins as Marc.

Publisher's summary

On the fringes of the galaxy, techno-pirates and research medics fight for the secrets of advanced extra-terrestrial technology. For the Doctor, however, a more personal battle awaits as he confronts his own guilt and the creatures that killed a friend: the Cybermen.


Part one

to be added

Part two

to be added



  • Combatta has programmed all the medical drones with her personality. She believes wiggling her tentacles is calming for humans.
  • Tegan points out that the Doctor hasn't processed Adric's death, and even gets confused between saving Marc and saving Adric.
  • The planet the Doctor and Tegan visit has been completed converted, with the Cybermen all remaining dormant until needed. They are not aware of intruders unless fired upon; when firing ceases, they become disinterested again.
  • The Doctor tries to hack into the cyber-mainframe.
  • To trick Herb and Creasey, the Doctor promises to give them the secret of time travel.
  • Marc's cyber-conversion is only internal, leaving his skin unchanged, as part of a new infiltration programme.
  • The Doctor decides everyone needs a break, and departs in the TARDIS, leaving Marc, Nyssa, and Tegan on Carlanna with some money.


Warzone & Conversion Alternate

Alternate cover.

  • This story follows directly on from Warzone.


External links

Community content is available under CC-BY-SA unless otherwise noted.

Fandom may earn an affiliate commission on sales made from links on this page.

Stream the best stories.

Fandom may earn an affiliate commission on sales made from links on this page.

Get Disney+