Sam clears himself to the pyramid and makes it to the Sphinx.

The scientists at HQ decipher the hieroglyphics, which indicates a hidden Sirian chamber below the Great Pyramid of Giza. He makes it into the museum, recovers the data from Stein's phone and transmits it to headquarters. Sam's insertion goes haywire after his helicopter is shot down by Major Bio-mechanoids and both teams are quickly wiped out, leaving Sam the sole survivor. Sam tells his squad that Bravo Team were protecting professor Stein, a scientist carrying hieroglyphics believed to contain instructions for powering up the Time-Lock. Their mission is to recon with Bravo Team after they lose contact with HQ. Sam 'Serious' Stone, a Captain serving in the Earth Defense Force, is dispatched with a small squad of his friends and some soldiers to Cairo in Egypt, which has been occupied by Mental's alien army for sometime. Unfortunately for them, the device lies dormant, so they must first discover a means to turn it on. Through it, they could send in some soldiers and reach a pivotal point in time and assassinate Mental in the past and change the future for humanity. Running out of options, the world leaders turn their attention to the Time-Lock, a mysterious alien device that, allegedly, is capable of granting someone the ability of time travel via an inter-dimensional portal. The already exhausted Earth Defense Force struggles to repel the invaders, which ultimately leads to a three-year conquest that has driven humanity to the brink of extinction. Team Alpha in a Black Hawk, on their way to the museum.Ībout a year after the failed alien invasion of Earth during the Tunguska Offensive, Mental deploys a massive fleet of warships to the planet in retailation, each one contaning tens of thousands of troops.

Serious sam 3 bosses