The first picture under the cut is Lightning Lord (Mekt Ranzz), brother to the twins, Lightning Lad and Light Lass (Ayla Ranzz). Her powers originally duplicated her brothers' but were altered to lessen items weight (the opposite of Star Boy/Starman's ability) in order to get around a Legion rule that prohibited duplication of powers. With her hands manacled and in a dungeon, her power is useless.
Lightning Lord was born without a twin, and that made him a freak on his home planet. He has serious sibling issues. He decided that Light Lass's rejection of the superhero life means she might be turnable to the Legion of SuperVillains.
Since Lightning Lad, Saturn Girl and Cosmic Boy founded the Legion of Super Heroes, Lightning Lord generally partners with a trio that chose to be their opposites (Cosmic King, Saturn Queen, and Lightning Lord). They showed up in a Superman/Batman story where they kidnapped the two heroes and raised them as evil tyrants in an effort to change history.
The next panel is Dawnstar, a winged Amerindian with an unlikely capability to fly faster than light. She races an energy villain named Lazon who can fly at lightspeed. Best not to think about it too much, but worth noting that, while flying, Wildfire is faster than Superman, and Dawnstar is faster than Wildfire.
In the next series of panels, Wildfire attacks Titania (strong chick) and Magno Lad. Wildfire was turned into a ball of anti-energy years before, and at this point required an energy suit to interact with the world. Wildfire and Dawnstar have just returned from her home on Starhaven (a whole race of winged Amerinds!). She has failed her vision quest to find her soulmate, and despite Wildfire's GIANT EMO over his inability to have sex and really truly be her boyfriend, they are a couple.
The next panel needs little explanation (Titania kicks Ultra Boy into Mon-el) but it does show off Titania's really awful haircut.
The next panel I honestly never realized was based on Leonardo's Last Supper. In my defense, I was a child. :) Lightning Lad may be holding court over the Legion of SuperVillains, but he is not the actual leader. He is group oriented enough that he was a reliable second in command.
The next panel was the punchline to the current Legion leader, Element Lad, congratulating himself on how well he was handling everything. Element Lad had a tendency to panic. In later continuity, he was retconed into having a relationship with a guy, Shvaughn/Sean Erin.
The next panel: supervillain banter! Radiation Roy is..well..a radiation user and Tyr has a sentient gunhand that, oddly, sometimes controls minds. Radiation Roy and Tyr argue over name fashion. In the old days, I'd've said Tyr was right. As an adult, 'radiator' sounds too much like a car part. I believe 'Radiation Roy' could be made to work by a post-modernist writer.
The next panels show an example of the frustrating secret symbols meant to stand for Interlac, the common language of that era. Dr. Gym'll is examining Saturn Girl, who stupidly went into battle while she was 9 months pregnant. The effort started labor. Her husband, Lightning Lad, and the Legion leader, Element Lad, wait anxiously. Element Lad is having a tizzy.
Saturn Girl had a normal child who became known in the letters pages as Nosegrabber Kid. We later learn that her child had a twin that was stolen by Darkseid (and this is the meaning of his parting prophecy) and turned into the giant superstrong mental-lightning shooting monster called Validus, who became a member of the Fatal Five in the past. (They made an appearance in Superman's World War event.
In the next panel, we see the castle that the Legion of SuperVillains has made homebase, along with signs of the alterations they've been making as part of their Grand Plan. In the spaceship are Queen Projectra and her consort, Karate Kid, returning from their honeymoon to Projectra's home planet Orando.
The last panel shows the heretofore unrevealed leader of the Legion of Supervillains, holding the captured ring of either Queen Projectra or Karate Kid. The green mist is Mistmaster, who took down the spaceship by gassing them. The white gloves were a red herring to throw readers' guesses off.