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"Third planet of the Sol system. Home to a significant variety of species, including Homo sapiens. Core of the human interstellar civiilzation. Evidence suggests visitation by advanced alien species in the distant past."
Serious Sam VR: The Last Hope description.[src]

Earth is the third planet of the Solar System, and the homeworld of the human race. The Earth is orbited by its only natural satellite, the Moon. Appearing many times throughout the series, Earth was subjected to multiple alien invasions.


Humans excavating the Time-Lock.

Thousands of years ago, during the time of the Ancient Egyptians, an advanced extraterrestrial race known as the Sirians discovered Earth and humanity. The Sirians sent out a scouting party in order to meet and establish contact with the humans. They landed in Egypt and began interacting with the inhabitants. Here, the Sirians began creating powerful plasma generators and other machines underground.

Before their downfall on Sirius, the Sirians contacted the remaining Sirians on Earth, telling them to stay put so that Mental could not detect them. That way, the species still had a chance. The Sirians on Earth complied, but received something unusual from Sirius; a strange device called the Time-Lock that allowed one to travel back in time to a certain location. This was to prevent Mental from obtaining it and using it for his own evil purposes.

The remaining Sirians on Earth began dipping into madness and depression because they were the only ones left. During these last few years, the Sirians disabled the main method to summon their spaceship, the SSS Centerprice, so that it couldn't be exploited by the Egyptians after the Sirians died. However, in case of an emergency, they created a backdoor involving elemental statues and some of the biggest cities in Ancient Egypt. Clues to this were hidden throughout old Egyptian texts and riddles in order to prevent any one person from piecing it together.

The last few decided to put everything they had in one crypt, in order to help the humans explore the galaxy when they were more advanced and to warn them about Chaad-Sheen. Everything, such as the location of the SSS Centerprice and what they knew about the galaxy, were buried in that crypt. One of their last acts was to activate the Time-Lock and set it to the time they lived in in case someone like the humans needed it for some reason.

Two millennia later, humans would finally discover this crypt and use it to explore the stars. Mental also began invading Earth at around this time soon after he was awoken from dormancy by the humans.


Serious Sam 1[]

Earth is present in this timeline due to the events of the planet's destruction not having taken place yet, which gives Sam Stone another opportunity to save his beloved planet. After the events of Serious Sam: The Second Encounter, the fate of Earth is not known, but Sam was able to save it this time and eliminate any presence of Mental's forces on the planet.

Serious Sam 3: BFE[]

Earth was attacked by a marauding force of aliens, resulting in humanity's downfall.

Sometime in the 22nd century, Mental discovers Earth and chooses to invade it, as it harbors intelligent life. When Mental invaded Earth, humanity suffered heavy losses. The world leaders were running low on options, and thus, the Earth Defense Force was formed from the remnants of Earth's military forces.

Instead of fighting Mental directly, the Earth Defense Force created a plan to assassinate Mental in the past by using the Time-Lock and changing the future. Once the two plasma generators located under the Anubis and Horus shrines were activated, this would let the EDF insert a group of soldiers know as Charlie Team into the past, and they would travel to Sirius and assassinate Mental while he was dealing with other matters.

The EDF rallied to defend their planet. Despite Mental's superior technology and magic, his army took many casualties. However, Mental's numbers ultimately proved to be too much for the EDF and the rest of humanity to handle. Eventually, the Earth Defense Force's headquarters, along with everybody in it, was wiped out nearing the end of the war, including Charlie Team. The destruction of their last headquarters and the Charlie Team signaled the end of the EDF and destroyed humanity's last hope.

The Earth, along with its moon, were destroyed shortly after the Battle for the Time-Lock in this timeline, signalling the end of the Mental War and whatever remained of the human race.

Serious Sam's Bogus Detour[]

Taking place in the same timeline as Serious Sam: The First Encounter, Earth soon becomes the interest of a planetary mining company known as Mental-Altani, who discovered Earth and its rich variety of life. Soon after finding the planet, they established a military base on the Moon and sent their troops down to Earth with the use of portals. Having sided with Mental, the corporation's primary mission is to go from one planet to another, experimenting with the toxic ooze on the local flora and fauna. If the experiments are not satisfactory enough, they will destroy the planet with the use of Interplanetary Renewal Devices, which are laden with bacteria that consume all matter in their path.

While experimenting with the ooze on Earth, the company began wrecking havoc on the planet's fragile ecosystems, causing pollution and enviromental destruction on a massive scale. Some of the local wildlife became exposed to the ooze, turning ordinary plants into carnivorous mutants and even causing animals to rapidly evolve and gain sapience. Most of this destruction occurred in Greece, Turkey, and parts of northern Egypt. Ironically, the wildlife that became mutated developed extreme hostility to any non-infected life and even Mental-Altani.

After Sam ends up on the Moon base, he is successful in neutralizing the portal and destroying the base before the corporation can destroy Earth with the warheads, saving the planet once again from Mental's intentions.

Notable locations[]


Main article: Egypt

Most of the events in the Serious Sam series take place in Egypt. The many locations here include Abu Simbel, Alexandria, Cairo, Giza, Karnak, Luxor, Memphis, Philae, and Thebes.


A major location in Serious Sam 4, Sam and the Alien Artifact Acquisition team went to France after learning that the Holy Grail was actually located there and not in Italy. After parachuting down into the countryside, they eventually meet up with each other in the fortfied city of Carcassonne.


Not many events take place here in the series, though in Serious Sam's Bogus Detour, it is the location of the portal that the Mental-Altani corp placed on top of Mount Olympus to send Mental's forces to Earth.


This is the location where the city of Persepolis is set during the Mesopotamia era in Serious Sam: The Second Encounter.


A country in south-central Europe and the location of many cities such as Pompeii and Rome. In Serious Sam 4, the Alien Artifact Acquisition team visited Rome to meet up with Father Mikhail, a Russian priest who could help them find the location of the Holy Grail. The A.A.A team also went to Pompeii to place beacons to activate the HAARP satellite which was used to erupt Mount Vesuvius.


Two locations in The Second Encounter are set in Mexico, during the pre-Columbian era. Notable locations include Palenque and the ancient Mayan city of Teotihuacan.

Nova Scotia[]

A region in Canada that Sam briefly visits in Serious Sam: Double D during the Jurassic period when he travels back in time after destroying the crystal beacon in Egypt.


A country located in Central Europe, Poland is the location that Sam arrives in upon entering the time portal in Mesopotamia. Here, he ends up in Krwawitze, a small medieval town.


The location of the Tunguska Offensive launched by the Earth Defense Force to neutralize the portal set up by Mental's forces.


A country located in Eastern Europe, near the Mediterranean Sea. During the events of Serious Sam's Bogus Detour, Sam visited the city of Troy in this location to search for the missing parts for a multi-mission aircraft so he could use it to fly to Greece.


Serious Sam 1[]

Serious Sam 3: BFE[]

Serious Sam VR: The Last Hope[]

List of appearances[]