Cronenberg Rick is a version of Rick Sanchez who originates from Cronenberg World. In the episode Rick Potion No. 9 Cronenberg Rick and Cronenberg Morty take a portal to Earth C-137 after they discovered that C-137 Rick turned the entire population of Earth, except Beth, Jerry and Summer, into Cronenbergs. Cronenberg Rick and Cronenberg Morty did this because they turned the entire population of Cronenberg World into normal Humans and wanted a world where they would fit in.
In "Close Rick-Counters of the Rick Kind" Cronenberg Rick and Cronenberg Morty were in the background as Rick and Morty were being escorted through the Citadel of Ricks.