This question stems directly from this answer.
If Rocket is only one of many animals created by the robots mentioned in the answer above, do we know what happened to the rest?
Presumably if Rocket is as tough / insane as he is, the rest could be the same.
In the 616 continuity (the comics), Rocket and other small animals were granted humanoid abilities & intelligence so that they could act as "companions" (think seeing-eye dog) for mental patients on Halfworld. Rocket eventually ended up in a role much like that of the head guard at the asylum, but through later events found a way to cure all of the patients at the asylum.
After the patients were cured, most of the animal companions left the planet to have their own adventures, but only Rocket's adventures were shown in the comics.
This question was tagged for the Marvel Cinematic Universe (MCU) and Guardians of the Galaxy 3 makes Rocket's origin story central. Therefore spoilers follow...
Rocket is a raccoon genetically modified by the High Evolutionary, as part of a group known as Batch 89. In captivity he befriended three of his cohort but all three were killed when Rocket made an escape bid. However, Rocket would eventually join the Guardians of the Galaxy and return to defeat the High Evolutionary, and free the surviving members of Batch 89 along with many other creations and captives of the High Evolutionary. These now reside at Knowhere.
