Emmerdale spoilers follow for tomorrow's episode (21 August).
Emmerdale has confirmed a tense sequence for Mackenzie Boyd and John Sugden for tomorrow night.
The most recent instalment that just aired on TV saw Mack look through John's scrapbook and come across a disturbing photograph.
This leads to him piecing together the events from New Year, tying into the final flashforward that we've been waiting to see.
Unfortunately for Mack, John realises that Mack has figured out the truth. Before long, Mack is running for his life through the forest.
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Mack actor Lawrence Robb said: "Last New Year we saw a handful of flashbacks and the one of Mack running has not been seen in an episode yet.. We actually filmed that flashback last October, and we finally will be seeing it within the show.
"In the original flashback, the audience members didn't know why Mackenzie was running. Was he chasing someone, or was he running away from someone or something? At last, all will be revealed."
Robb added: "The flashback scene was filmed last October, and at the time we didn't know when it was going to play out within 2025. So just in case there could be a future issue with hair continuity - as potentially I could have grown a mullet by the end of the year - we decided to stick a beanie hat on Mack.
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"But this choice didn't help with the heat, as this time we were filming this episode in the height of summer. And for all the filming, I had to have this beanie on. So I was very, very warm."
He concluded: "But I'm excited for the audience to finally see it unfold and how it fits into Mack's storyline."
Emmerdale airs on weeknights at 7.30pm on ITV1, and streams on ITVX and YouTube.
Read more Emmerdale spoilers on our dedicated homepage.
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