The Altered-Reality Monitoring and Operational Response group is an agency similar to SHIELD and SWORD. But while its fellow agencies monitor terrestrial and extra-terrestrial activity, ARMOR monitors extra-dimensional activity, guarding Earth against possible invasion from hostile parallel worlds. Naturally, it maintains close watch on the Nexus of All Realities in the Everglades swamp. ARMOR is overseen by Charles Little Sky, whose mutant power to navigate dimensions makes him a natural for he job.

Other agents unrelated to the X-Men include Morbius, Howard the Duck, Jocasta, and Machine Man.