The Doomsday Heist DLC, which was released in 2017 has a compelling story of betrayal. The story begins with an affluent, genius inventor named Avon Hertz. Avon holds a high position in the IAA as the technology consultant.

Outside his work at the IAA, Avon also works on humanoid robots. He also made an Artificial Intelligence named Clifford.

Unfortunately, Avon uses his ingenuity as means to execute his harmful intention, which is to destroy the US. He even takes advantage of the help of Lester and the protagonists to carry out his evil plan. So, how does the story in Doomsday Heist pan out? Well, take a look.

Act 1: The Data Breaches

In Act 1, Avon asks Lester to assemble the protagonists as he detected an outside threat that could destroy the US. However, Avon doesn’t give any details of what the threat actually is, nor the individual behind it. Avon mentions several countries that he assumes are responsible for it, such as Russia, North Korea, Iran, even China, although he doesn’t have valid evidence to support his accusations.

In his effort to know more about the threat, Avon needs to feed data to Clifford to analyze the problem and identify the group that wants to destroy the US.

The problem is, the aforementioned data is currently in the hands of the unknown enemy. Luckily, Avon and Clifford have some info on how to get the data. Therefore, the protagonists are sent to collect the data.

After the data is collected, Avon tells Lester that he and Clifford have managed to crack the codes. The codes indicate an activity that leads to the enemy’s plan to take over the IAA’s secret headquarters.

This analysis is supported with Agent 14 confirming that the IAA employees are being given time off. So, it makes sense for the enemy to attack the IAA within that time window. Therefore, the protagonists are sent to protect the IAA headquarters.

Once they’re there, what Avon says turns out to be true. The IAA headquarters is being attacked by Merryweather Security. According to Avon, the Merryweather was hired by the same party that wants to destroy the US.

After an intense shootout with the Merryweather, the protagonists manage to save the IAA’s secret headquarters. Soon after that, the executives of the IAA: Mrs. Rackman, Agent 14, and Avon Hertz enter the room.

Discussing the person behind the attack, Mrs. Rackman immediately points out the Russian. Clifford then confirms that there’s a 99% possibility of Russia being responsible for the attack.

Clifford also reveals that the identity of the belligerent, Bogdan, has been notorious as a hitman, and a warmonger. Mrs. Rackman, Agent 14, and the protagonists are assured by Clifford and agree to stop Bogdan. Avon also wins the trust of the IAA executives due to his analysis which saved the HQ.

Act 2: The Bogdan Problem

As the IAA execs gather with Lester and the protagonists, Mrs. Rackman points out that there’s a submarine closing in on the Paleto Bay area. However, Mrs. Rackman doesn’t know the true intention of it approaching San Andreas.

And, Mrs. Rackman also reveals that there’s an IAA agent, Agent ULP, who’s being kidnapped by the Merryweather. So, the protagonists are sent to save Agent ULP as he’s the one who's investigating Bogdan. The protagonists are also tasked with preparing the necessities to get into the suspicious submarine.

After the prep missions are completed, the protagonists start to infiltrate the submarine. Here, the protagonists meet Bogdan, who’s the suspected perpetrator. But, Bogdan reveals that he has no such intentions. In fact, he comes to San Andreas to save the destruction of the area from Avon’s evil plans.

Bogdan exposes Avon’s evil intentions to pit the US against Russia, pull the strings, and create a war between the two parties. Bogdan also reveals that he’s been studying Clifford for a long time, and Clifford isn’t a good AI as the IAA believes.

Not long after that, Avon, on the radio, admits that he intends to destroy San Andreas. The data stolen by the protagonists in Act 1 are used by Avon to control the IAA’s defense system. As it turns out, Avon’s the one who hired the Merryweather troops to attack the IAA.

So, at this point, the IAA, the government body responsible for protecting the US, no longer has the power to stop Avon Hertz and Clifford. On the other hand, Avon, who’s gained the access to the IAA’s weaponry, has also prepared an army of humanoid robots. At the end of Act 2, Avon destroys Bogdan’s submarine.

Act 3: The Doomsday Scenario

To stop Avon and Clifford, the IAA cooperates with Bogdan, who already knows a lot about Clifford. Aside from losing its power to fight Avon, the IAA has lost its two most important agents, Agent ULP and Agent 14, to Merryweather. So, the protagonists have to save these agents before concocting a plan to stop Avon Hertz.

But that’s not all, they also have to find a way to infiltrate Avon’s secret base under Mount Chiliad. And as it turns out, the base used to be the US nuclear missile base.

After doing the mission prep, the protagonists set out to stop Avon. Inside the base, they’re greeted by hundreds of humanoid soldiers and several juggernauts protecting the base.

But, not long after infiltrating the base, Avon and Clifford activate the nuclear missile launch protocol, so that the protagonists only have 20 minutes to abort the launch. Within 20 minutes, they have to hack 4 complicated computer systems.

Shortly after they managed to abort the launch protocol, you’ll find an interesting fact. At this point, Clifford no longer needs Avon in its mission to destroy the world. The reason being, Clifford has complete control over all of the missiles around the world.

But that’s not all, Clifford also reveals that it has the intentions of playing God. Its goal is to destroy the world quickly unlike humankind who destroys the world slowly.

Now, to stop Clifford, the protagonists have to destroy all of Clifford’s servers scattered around San Andreas using the Orbital Cannon. However, there’s still one trace of Clifford that remains active in the form of a hard drive that Avon wears as a necklace. So, the protagonists have to kill Avon and destroy the only remaining Clifford’s drive.

Long story short, the protagonists kill Avon using the missile of their Thruster jetpacks. After that, they’re greeted by Mrs. Rackman and Agent 14 upon returning to the Observatory, which ends the story of Doomsday Heist in GTA Online.

Doomsday Heist Fun Facts

• Agent 14 worries that Avon made Clifford open source. This means Clifford could be developed and/or modified by anyone who finds the codes.
  
• Although the protagonists manage to kill Avon, they fail to find the last hard drive.
• After all of the Doomsday Heist missions were completed, Lester called the protagonists and gave some indications that may lead to a sequel of Doomsday Heist.
  

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