Infinity-Man is the name of several characters appearing in DC Comics, in the Fourth World storyline.
Both are alien heroes associated with the New Gods, with the second, Drax, being Darkseid's brother and an ally of the Forever People.
[1] Infinity-Man appears in Young Justice, where he is depicted as the combined form of the Forever People rather than a separate entity.
[2] Infinity-Man is initially Astorr, an alien warrior who gives his title to Drax, Darkseid's brother.
The Forever People can summon Drax using their Mother Boxes, with them entering limbo while he is active.