Equilibrium (unproduced novel)
From Tardis Wiki, the free Doctor Who reference
Equilibrium was a novel pitched by Simon A. Forward, first to Virgin Books for their Missing Adventures line, and then again to BBC Books for their Past Doctor Adventures line.
The novel would have featured the Third Doctor and Liz Shaw in an adventure set between Inferno and Liz's departure from UNIT. It would have been a prequel to the Eighth Doctor Adventures novel Emotional Chemistry.
Notes
A completed version of the novel was released online by Forward. As this version was unlicensed, it is outside the scope of this wiki.