While largely a "23-minute sex joke," the episode features several underlying themes and parodies:
Rick brokers a peace treaty with the CHUDs after it is revealed he got their princess, Poñeta , pregnant. Themes & Humor Rickdependence Spray
The episode follows several escalating, absurd threads that culminate in a national crisis: While largely a "23-minute sex joke," the episode
Morty uses a horse breeding mount at Beth's workplace for self-gratification. Rick steals the "horse" semen to create a weapon against the CHUDs (Cannibalistic Humanoid Underground Dwellers), but instead creates a sperm army. Morty accidentally contaminates a barrel of horse semen
Morty accidentally contaminates a barrel of horse semen with his own, which Rick subsequently mutates into a biological weapon, creating a swarm of giant, sentient "Space Sperm". Plot Highlights
Morty desperately tries to hide that the monsters are his "children," but the truth is eventually revealed by the Sperm Queen .
The President plans to lure the sperm to a giant human egg in Las Vegas to destroy them.