Slipback

From Tardis Wiki, the free Doctor Who reference

Slipback was a BBC radio production in Earth-33⅓ that featured the Sixth Doctor and Peri Brown. The Doctor believed that Slipback could have been a whole new beginning for them and that entering the world of radio could lead to big things but this opinion changed drastically in the opposite direction upon meeting their special effects man. (COMIC: Doctor Who? 178)