Therefore, its known narrative elements are not a part of the Doctor Who universe as we, on this Wiki, choose to define it. It may have been the basis for a similar story in another medium, however — and that story may indeed be valid.
Mind of the Hodiac was an unproduced story for Doctor Who. It was initially drafted by Russell T Davies, being the very first Who script he ever worked on.[1] The story would've featured the Sixth Doctor and Melanie Bush.
When the original run for the series ended in 1989, Davies received an email from Andrew Cartmel, saying "Thank you for your idea, I liked it and put it to one side for consideration but now we've closed down..."[2]
During the Doctor Who: Lockdown! watch-a-long for The Runaway Bride, Davies found a few pages of the script, and started sharing it online. Following that, Big Finish announced that they would produce an audio adaptation of the story.
