Something to be feared, when coming from beyond our Earth, and DC's heroes dealt with this threat decades ago (and will be dealing with it again on their live action CW shows).
Hard to tell your invaders without a scorecard, so here's a few facts to help you keep the Alien Alliance members straight.
DaxamitesMon-El met Superboy (just a little before the current age of heroes, as Superboy was Superman, as a boy, learning to deal with his powers in Smallville). Daxamites have powers similar to Kryptonians (flight, super-strength, invulnerability, vision powers), but without the weakness to Kryptonite. Instead, their weakness is common lead, and it is fatal to any Daxamite who is exposed to it.
ThanagariansHawkgirl can attest, their history gets confusing sometimes).
Warlords of Okaara
Earth's response to the alien Invasion.....and check back for a little more Invasion! coverage coming soon!