Aliens from another dimension, in which time passes at a dramatically higher rate. This causes them to physically age what appears to be several decades in only a few minutes when they enter our dimension. First seen in Invincible: Family Matters, where Mark and Omni-Man fight off their invasion. When they returned, having developed devices to counteract the rapid aging they experience in this dimension. Mark and the new Guardians of the Globe fought them off, with considerably less ease. Once the anti-aging secret was revealed and exploited against them, the Flaxans began to age even more rapidly than before, and they again retreated. While individual soldiers seem to give heroes no particular trouble, the strength of Flaxan invasion forces seem to be based in their almost limitless number of soldiers.