In the midst of a fun, rambling interview with the Sunday Times, Davies was asked about things he didn't manage to do during his tenure on Who and his answer was surprising:
I would have loved to have done a Star Trek crossover. The very first year, we talked about it. Then Star Trek finally went off air. Landing the Tardis on board the Enterprise would have been magnificent. Can you imagine what their script department would have wanted, and what I would have wanted? It would have been the biggest battle.