Power Rangers: Spartan Assault

With the Covenant at their door, and with every option coming up short except the Spartans, humanity is desperate for new weapons. At the height of their despair,Halsey reaches back to Earth's past to obtain a power like few others. The only thing is, she's far from the first to access the Morphing Grid. And Master Chief has no clue if being a Ranger is worth the trouble it brings.