These are the second Legion foes to be highlighted on JLU. The first was Mordru (defeated by Elognated Man) after trashing the whole JLU (minus Booster Gold) for most of the episode. One might consider Darkseid to be a Legion villian, but unlike the Fatal Five and Mordru, Darkseid originated elsewhere. Darkseid did swap out the planet Daxam with another planet under a yellow sun to create an army of Daxamites (think Superboy). The first thing he had his new mind-controlled army do was terraform Daxam into his likeness.
Time to rein myself in before I turn a JLU thread into a LSH thread. I sure hope that the LSH series in development gets green-lighted.
He also possessed the mind of a petulant child - not actively mean, but prone to temper tantrums - which made him fairly unpredictable. (He was, it would be revealed (during Giffin’s run, IIRC - maybe Levitz’), the son of Lightning Lad and Saturn Girl, kidnapped at birth, and altered by Darkseid. Post ZH, his powers and such are more or less the same, but he was created as a weapon by a now-dead civilizarion. He hasn’t been shown to exist in current continuity, as of yet.)
At its height, the Legion was almost as big as the JLU, and at *least *as powerful. They had Superboy, Supergirl, Mon-El (same set of powers), and Ultra Boy (all of Superman’s powers, used one at a time, but a few of them worked better than Superman!), and that’s only the start.
Boomerang’s about to start showing “Justice League.” It’ll be nice to see some of the shows that I missed and then never got to see re-ran like the first part of the Thanagarian thing. Hopefully they’ll pick up JLU soon too.
They started slow, though. Their first “true super-villain” (according to Paul Levitz, then writer/editor, now president of DC Comics) was the rather lame “Monster Master” from Adventure Comics#309.
I’ve seen reports that suggest both yes and no, so, I wouldn’t say it’s safe to assume, just yet.
(For instance, last we heard of it, Supergirl was getting replaced with Superboy. Of course, with the legal stuff surrounding Superboy up in the air, we might just get Kara back yet.)