The Time Travellers (series)
From Tardis Wiki, the free Doctor Who reference
The Time Travellers was a series of audio stories produced by Bill Baggs Video. They featured Sylvester McCoy and Sophie Aldred as The Professor and Ace. These characters so closely resembled the ones they portrayed in the Doctor Who series that the BBC eventually stepped in and a number of changes had to be made, the main one being that the main characters' names were changed to The Dominie and Alice.