He explained: “What Graham has is such a distinctive voice, so I said ‘let’s hear him first, and not see him.’
“You want to feel who that is first and then you see him, it’s like ‘is that him?’”
Maril Davies then admitted it was particularly challenging to keep McTavish’s appearance a secret in the run-up to season five.
As Buck makes sporadic appearances throughout later novels in the series, fans are keeping their fingers crossed for another cameo from Graham McTavish somewhere down the line.
Outlander season 6 will premiere in early 2022 on Starz.