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Sirius is a planet that is mentioned in almost all Serious Sam games. It makes its only appearance in Serious Sam 2, where it is also the the setting for the last seven chapters.


Sirius is a planet located in the Canis Majoris constellation, which orbits the star of the same name, Sirius. Compared to Earth, Sirius is a much more technologically advanced planet. Species that are indigenous to this planet include Gnaars and the Sirians. It is also possible that Sirian Werebulls originate from here. The Sirians were a humanoid race that originally lived here before they were wiped by Mental's army. Gnaars are a species of omnivorous mammals with one eye in the center of their torso, just above their large gaping mouth. As they are not as intelligent as the Sirians, Mental decided to add them to his ranks as light infantry units rather then wiping them out.


Sirius was originally the home of the Sirians, a superior race that made contact with various species within the Canis Major constellation, such as the Kleers. After an unknown period of time when the Sirians sent a scouting party to Earth, Mental found out about the species, and, as they were intelligent life, consequently executed them. With the species extinct on their homeworld, they were then resurrected to serve in his army.

Notable locations[]


Like Earth, Sirius has only one orbiting moon, known as Kronor. This moon has a polar climate and a very cold atmosphere. On this moon, Mental has installed various military bases, complexes and prisons, where it serves as a base of operations for his forces.


The capital of Sirius, Siriusopolis is a large, thriving metropolitan area which is roughly the size of New York City in comparison. This is also the location of Mental's home.

List of appearances[]