The Rick and Morty of this dimension leave after they accidentally turn the entire world into regular humans. They subsequently take a portal to an alternate version of Earth where Rick C-137 had recently turned almost the entire human population into Cronenbergs in the episode "Rick Potion No. 9".
Cronenbergs who turned into ordinary normal people.
Quotes[]
“
Here we are, Cronenberg Morty. A reality where everyone in the world got genetically Cronenberged. We'll fit right in, Cronenberg Morty. It will be like we never even left Cronenberg World.
— Cronenberg Rick to Cronenberg Morty, Rick Potion No. 9
“
I'm going to, ya know, miss Cronenberg world because everyone was Cronenberged all along like us from the beginning, ya know? I mean, I wish we hadn't genetically ruined Cronenberg World beyond repair like we did, ya know, and turned everyone into regular normal people.
— Cronenberg Morty to Cronenberg Rick, Rick Potion No. 9
“
I'm not your Morty. I come from a Cronenberg World that Rick goofed up and made everyone monsters like you. So here we came to be amongst our own kind, but everyone here is a mindless savage, too. And, well, we just assumed that if this world was turned into monsters, that you guys were, for sure, the least likely to survive.
— Cronenberg Morty to Prime Summer, Rick and Morty Issue 45
Trivia[]
The word "Cronenberg" is a reference to the Canadian filmmaker David Paul Cronenberg. According to Wikipedia, Cronenberg "...is one of the principal originators of what is commonly known as the body horror or venereal horror genre. This style of filmmaking explores people's fears of bodily transformation and infection."
It's revealed in "Rick and Morty Issue 45" that the Cronenberg World's Cronenbergs are fully capable of speech and critical thought. This differentiates Cronenberg Rick and Cronenberg Morty from the mindless Cronenbergs of the infected Earth, as they can fully think and talk like "normal" people.
Even though this dimension is still called "Cronenberg World", it is no longer inhabited by any Cronenbergs.