This is what happens when the Spartans we ended with in Ghosts of Onyx find themselves in separate worlds where magic is real, technology is slow, heroes exist, and the missing could be closer than you think. Based off the characters from the books, games, cartoons, comics, tv series and movies that make up this web of worlds.

To rescue a Spartan lost in time, the Master Chief and Blue team must go on their wildest mission yet: back in time to the 21st century. But things get complicated as they draw the attention of a certain team from the Naval Criminal Investigative Service.