The Face of God (unproduced TV story)
From Tardis Wiki, the free Doctor Who reference
The Face of God was an unproduced story written by then-producer John Wiles for Season 3. Little is know about it.
It was believed to have concerned a planet which the Doctor would visit at various points in time, unwittingly setting himself up as a God and spurring on an order of religious fanatics over the coming centuries. The revelation that he was the order's deity would not have come until the final episode.