The Halo series didn't have to be ... The Forerunners suffered Flood infections, prompting humans to destroy infested ships and planets. This ignited long-standing tensions into a prolonged ...

Halo Season 2 ends with John and Makee surviving on the Halo, while Onyx gets taken over by the Flood parasites ... survive after being saved by a UNSC ship. Kai seemingly died while crashing ...