(86 crossover) For nine years, the Republic of San Magnolia has waged a war of attrition against the Legion menace. In the eyes of greater powers, their fight to survive is inconsequential. For one side, it is a chance to exploit and regain their power. For the other, it is a mission to protect the planet and its people at all costs.

(86 crossover) Caught in the aftermath of the Fold Weapon's destruction, Pilot Jack Cooper and BT-7274 are hurled into a foreign world, and are thrust once more into a decade-long war. However, their arrival also brings with them new technology to be usurped by the tireless Legion. Can the Eighty-Six of Spearhead Squadron continue to defy death with their newfound allies?

(Crossover with the 86 light novel) So long as there are wars to be fought, a Spartan never sits idly by. Thrust into a foreign world, with little hope of returning to UNSC territories, Spartan-B312 navigates a course of action aligned with UNSC interests. He finds a team reminiscent of the doomed Spartan-IIIs, carving a path for themselves in a war with odds stacked against them.