Time Apart (audio anthology)

 was the two hundred and sixty-sixth release in Big Finish's monthly range. It featured Peter Davison as the Fifth Doctor.

Publisher's summary
Separated from his companions, the Doctor attempts to find solace in the history of his favourite planet – Earth – but instead discovers new threats lying in wait.

Travelling from twentieth-century East Berlin to sixteenth-century Strasbourg, the Doctor encounters creatures from other realities: monsters beneath the waves, and human beings determined to exploit their fellow man.

But how long can he survive without a friend?