The formation of the Legacy team.

The Legion's ‘final battle’ came when Dream Girl returned from Naltor with her estranged ex-husband Star Boy, and called the entirety of the Legion to the old HQ (where some still lived), warning of a dire and imminent threat to all life. Soon after the team gathered (and Dream Girl arranged for the children and civilians present to be sent away), a massive Boom Tube opened over and around the HQ, and when it closed with a thunderous explosion, Legion Headquarters, and the Legion itself, was gone, for the most part, never to be seen again. What sort of desperate battle on Apokalips followed is unknown, only that days later, a much smaller Boom Tube opened to disgorge the smoldering body of Brainiac 5, barely clinging to life, brain wracked by a cyber-virus that no science could seem to root out (and in fact ended up co-opting every machine used to try and stop it, becoming a threat to the entire city in itself!).

Brainiac finally fought off the sentient malignancy within his mind, and ended up helping to rescue the city from the thing that had been brought to our world within his skull. He had no recollection of the final battle, but confirmed what sensors had begun to discover, that whatever hyperspace routes existed to Apokalips were now destroyed, and the planet may well have been destroyed (or at the least, somehow made inaccessible to the rest of the universe). According to scans, Apokalips seemed to simply vanish, seconds after Brainiac appeared on earth, leading to the conclusion that he was sent back, or escaped from, whatever fate befell the rest of the Legion, and the homeworld of their greatest foe. As a result, more than one member of the Legion Legacy team resent him, some openly blaming him even, for the fact that he made it back, while their parents stayed and fought, and perhaps even died. Coupled with the loss of every person on earth that he ever valued or called friend, Brainiac 5 left a clone of himself behind to assist the Legacy team now forming (who had been primarily responsible for keeping Metropolis intact when the Apokaliptian cyberviral menace was tearing it apart), while he fled to Colu to live out his remaining days.

Within the following weeks, children of the various Legionnaires (some, such as the daughter of Dream Girl and Star Boy, unknown to the other Legacy members before their arrival), and other super-human teens, began to assemble at the crater where their parents and heroes were last seen, choosing to take it upon themselves to rebuild and honor their parents sacrifice by forming a new Legion, a Legacy Legion. Legacy Legion HQ is a toroid structure, floating serenely above the force-walled-off-crater that is all that remains of their parents and predecessors headquarters.

When Graym Ranzz first arrived at the crater, drawn by news reports of construction going on, he found himself surrounded by other onlookers, including some he recognized as fellow children of the former team. Looking up, they saw the structure taking shape, and a purple-jumpsuited figure, which they assumed to be Brainiac 5, was maneuvering many-tonned slabs into position, where they seemed to simply lock into place. Having a Flight Ring of his own, Graym flew up to ask what was going on, and how 'Brainiac 5' had gotten such amazing powers... Finding out that he was speaking to Brainiac *6,* Graym jumped to the conclusion that the young Coluan was the child of Brainiac 5 and Supergirl, causing the Coluan to laugh (a disturbing sight indeed to Graym, who wasn't aware that Coluan's *could* laugh) and explain that the building had internal antigravity generators, and that he had to be in close proximity to order them to maneuver themselves into place.

An observant viewer might note that if the vanished Legion HQ was to suddenly re-appear in it's old location, Legacy HQ would be floating above and around it, encircling the central spire of the old HQ like a ring on a finger... (And indeed, Legacy HQ does look like a gargantuan Legion Flight Ring.) Some say this is a gesture of respect, not to occupy the exact same space as the Legion HQ, to symbolize that they may have taken on their mission, but can never, and will never try to, replace them. Others point out that many of these children no doubt have lingering hopes that their parents may yet reappear as mysteriously and suddenly as they vanished, and ‘left room for them.’ In any event, the construction plan was implemented by Brainiac 6, although it is known that the original design plans must have been prepared by his 'father,' the last surviving Legionnaire.