The other one of Frobisher audio dramas from Big Finish Productions is Doctor Who: The Holy Terror, starring Colin Baker and Robert Jezek, written by Robert Shearman and directed by Nicholas Pegg. And it is a blast; story starts off with TARDIS itself going on strike after Frobisher screws around with it. The duo ends up in the middle of a bizarre religious struggle of Douglas Adams proportions – and are at risk of ending up as deities themselves.

This audio drama is among the best I've heard so far. But don't take just word of Penguin/Doctor fan like me. The Great Russell T. Davies, the man who spearheaded Doctor Who's comeback and the first four seasons the new series, calls The Holy Terror (together with the excellent Fifth Doctor story Spare Parts):

...some of the finest drama ever written for any genre, in any medium, anywhere.