This pizza is cold and gloomy, like my childhood.
If you don't get the panel with GL on the right side, that's Green Lantern Hal Jordan talking to Specter Hal Jordan. Technically they can't both be in the same continuity at once. There's the joke there.
And, actually, the two figures are quite similar. Plainly the figure makers use the same mold for the two. Cheapos.
And yes, in the last panel, the JLA Watchtower blows up. Score one for Darkseid.
 
    

When evil spreads across the land, and darkness rises and the monsters roam. When the creatures of the night make beautiful music, and the things that go bump in the night go bump with greater enthusiasm. When the world is in peril and is in need of a hero...

These guys are, sadly, the best the world can hope for. These are the adventures of the heroes of CVRPG. They mean well, they try hard, and occasionally they do the impossible...

They actually do something heroic.