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It's the series that for may has filled the gap left by Game of Thrones and since it hit our screens last month, Chernobyl has gone one better and become one of the highest rated shows ever.
The five-part mini series follows the horrifying aftermath of the infamous nuclear reactor disaster that hit the small Ukrainian town of Prypyat in 1986.
And if you're one of the millions who have been tuning in every week to watch the dark story unfold, you will no doubt be counting down the hours until the final episode airs tomorrow.
Well, lucky for you the good people at HBO have released a short teaser trailer along with a synopsis of the episode.
The episode's synopsis says: "Valery Legasov (played by Jared Harris), Boris Shcherbina (Stellan Skarsgård) and Ulana Khomyuk (Emily Watson) risk their lives and reputations to expose the truth about Chernobyl."
The finale follows the trial of of six former technicians which took place in July 1987.
According to reports, the court case was aimed at finding the cause of and the person responsible for the disaster which killed more than 30 people in the first instance, and many more in the years that followed.
And by the looks of the 57-second clip, the last episode of the season will flit between the court hearing and the hours leading up to the disaster.
Giving evidence at the hearing, physicist Ulana Khomyuk says: "To understand what happened that night, we have to back to the first critical moment. The time is 28 past midnight."
The gripping finale will centre on the actions of deputy chief engineer and supervisor Anatoly Dyatlov - Paul Ritter - plant director Viktor P. Bryukhanov - Con O'Neill - and chief engineer Nikolai Fomin, played by Adrian Rawlins.
And it will delve into the events which led up to the death of hero, Valery Legasov, who took his own life two years after the catastrophe.
In the trailer we see Khomyuk talking to Legasov. She says: "When your testimony arrives, insist on reform."
"I've already given my life, isn't that enough?" asks Legasov, who, at the end of the teaser, we see taking the stand to give evidence.
Since it first aired last month, the series has received rave reviews, including a rating of 9.5 out of 10 on IMDb, beating the likes of Planet Earth II in second place and Band of Brothers in third.
The final episode airs on Sky Atlantic on Tuesday, 4 June at 2am and again that evening at 9pm.
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