Gray Smurfs

The Grey Smurfs are a race of created transitory beings that are identical to the Smurfs, that were created by Papa Smurf in the original comic book story "The Smurf Threat" and its related adaptations in Smurfs fanfiction.

Empath: The Luckiest Smurf stories
In the EMPATH: The Luckiest Smurf story "Smurfs Of Grey: A Narrator's Story", the Grey Smurfs are all duplicates of the Smurfs Narrator has encountered in that particular story which do not include Empath, Baby Smurf, or the Smurflings. They are led by a being called the Great Leader, a copy of Papa Smurf who is not only very authoritarian rather than paternal over his Grey Smurfs, but has also shown an interest in Smurfette, offering to make her the Great Matron of the Grey Smurf Village when she and her fellow Smurfs were captured by the Grey Smurfs.

Hero: The Guardian Smurf stories
In the HERO: The Guardian Smurf story "The Grey Smurfs", the Grey Smurfs are evil copies of every Smurf. They are led by a being called the Great Chief, who is an exact copy of Papa Smurf and are protected by an evil Guardian called Hero, whom has shown interest in both the normal counterparts of Smurfette and Wonder, demanding that they both marry him in exchange for the freedom of their fellow Smurfs when the Grey Smurfs invaded their village. This adaptation of the story does not include Baby Smurf or the Smurflings.