Pretty Little Liars
Deception is the whole theme of this show, so it's no surprise that Toby Cavenaugh was actually played by James Neate during the first few episodes. He even had a different name--Toby Marshall. After Keegan Allen took over the part, the name change matched a recasting. Neate left the popular drama to star in the Amazon show The Man in the High Castle, which received high acclaim.