Finally getting aorund to Planetary/The Authority: Ruling The World
Continuity note (and a slight mea culpa), this episode is set sometime between issues 8 and 11 (there's a mention of City Zero, which we see in issue 8, and the events of the story are mentioned in issue 12, which is immediately preceded by 11 (and you know what I mean)
The Doctor's forcefield at the start is called a Storm Wall, which is a reference to the force field Skywatch had in Stormwatch
References: As mentioned above, the author in the 1931 section is indeed HP Lovecraft, using his noted racism as a plot point.
The giant squid monsters are referring to a few things - the Cthulu Mythos (going back to Lovecraft), The designs of HR Giger, and as mentioned above, That one image of the JLA fighting Starro.
The idea of aliens sending biological weapons to subsume, adapt or otherwise replace humans is an old SF trope, examples including the Alien series, Species, the Body Snatchers series, and more recently The Expanse.
The Worldruler is a reference to self-replicating robots in general, but specifically the Von Neumann Probe, a theoretical type of self-replicating space probe, which would travel to a solar system, use local resources to make new copies of itself and then move to other systems. Though the proposed Von Neumann probe isn't an invader.
So I'm not a big fan of the cover, it's a very basic composition, and having Planetary's logo replaced with one in the same style as The Authority's fits the motif of Planetary changing its logo from issue to issue, but it's not up to the typographic excellence of the main book.
The story does a good balance between being an issue of Planetary and an Authority arc. It's a nice touch that Snow, Jakita and the Drummer show up in the background as the Authority evacuate civilians, and we switch from the widescreen action to a flashback and a literary reference.
There's a few awkward moments where people don't act quite right - Jakita wanting to hack The Authority doesn't fit Planetary's remit, and the secretary joining in Snow's joking while strangling Drums doesn't quite work; while on the Authority side of things Jenny seems OK with there being helicopters outside Brass' base in the Adirondacks, and doesn't ask any questions about where the original Worldruler is when they get to the computer room at the end of the fight.
Overall it's a good story, there's not a lot of depth to the Planetary side of things, but Ellis does a good job of balancing the two types of story without one set of heroes overshadowing the other.
Also, that last page. Coming Soon: Batman/Planetary. ha ha ha ha ha ha ha ha ha