After returning home from their harrowing adventure on Eritria, Mac and his children are confronted with the destruction of Earth by demons from a dark dimension. Small bands of human resistance fighters still roam the land, fighting to stay alive in a world where humans are the hunted. Mac and his team will fight their way to Egypt and attempt to right what went wrong with Earth by tapping into the energy of an ancient and powerful megalith. With help from a tribe of warriors and the long-lost Ark, they may have a chance. The price for returning to Earth is high, as the hero's prepare to take on their biggest challenge, Lucifer in a desperate bid to rid the planet of an everlasting evil force.