After the original team developed a top-secret research laboratory to take the shattered ghosts to the next level. But when the discovery of an ancient artifact unleashes an evil force, both new and old must join forces to protect their homeland and save the world from the Second Ice Age... from the very thing that unleashes an unstoppable force from the depths of history. As chaos reigns and pure evil plunges the world into darkness, the Ghostbusters must step forward once again to save humanity from the brink of doom. With two generations of Ghostbusters fighting side by side, the stakes have never been higher. Will they be able to avert the inevitable before everything freezes?

Tehran, Iran, August 19, 1953. A group of Iranian conspirators who, with the approval of the deposed tyrant Mohammad Reza Pahlavi, have conspired with agents of the British MI6 and the US CIA, manage to put an end to the democratic government led by Mohammad Mosaddegh, a dramatic event that will begin the tragic era of coups d'état that, orchestrated by the CIA, will take place, over the following decades, in dozens of countries around the world.

During World War One, a British Army corporal tries to save his young friend from a terrible injustice.