Lead Actors' Prior "Who" Appearances

It's no surprise that, with so many actors appearing in "Doctor Who," some get "re-cast" in other Whovian roles throughout the years. However, a few of the main actors in the franchise previously appeared in other episodes. Jessica and Phillip look at Eve Myles appearing as a guest star before moving on to "Torchwood," and Freema Agyeman appearing in a Tenth Doctor story before being cast as the new Tenth Doctor companion. They then do an in-depth discussion of "The Fires of Pompeii," with guest actors Karen Gillan and Peter Capaldi before they became, respectively, a companion and a Doctor.

Peter Capaldi was not the first Doctor to appear previously in the franchise as a guest role - in their look into the TARDIS library, the couple examine the Fifth Doctor story "Arc of Infinity," with a Gallifreyan security chief played by soon-to-be-Doctor Colin Baker.

Do you think all actors' prior appearances in "Doctor Who" should be tied together in their characters' stories?