Survivors of the Mutant Dawn

On April 29th, 2154, the world changed forever. Mutants decided to rid the world of humanity by destroying the very landscape of civilization. Secretary of State, Burt Isabela, knew this day would come. He planned with this brilliant brother, Dr. Michael Isabela, to build an underground facility to withstand the onslaught of countless laser nuke razes on the surface. Once the word got out of the impending global disaster, Burt sprang his plan to survive.
With the help from a witty South African spy, they escaped with the 70th President of the United States. They arrived at the facility, called Lifeboat, there were more questions than answers. An ancient briefcase from the CIA revealed that a surge of the mutant race may have been caused by the arrival of extraterrestrial DNA from an alien crash during the Ice Age. The plan was simple. Return to Earth's surface within 20-25 years when the radioactive fallout material has subsided.
But calculations from unpredicted variables made that time to wait longer than a lifetime. About 900 years longer. To make matters worse, a power struggle for control of the underground super bunker ensued and cost lives and trust. Once the battle was over, a hard decision had to be made to survive until then. In order to stay alive to see the surface, a steep price had to be paid to succeed. The future they woke up to was one where history was lost and centuries of the alien DNA transmission changed most all forms of life.