Space Dragon

Unidentified Sentient Race 6 refers to a pterodactyl-like sentient being that is alluded to in the non-canonical Captain N: The Game Master comic Breakout. Ridley, a common antagonist in the Metroid series, is the only member of his race, if one canonically exists. Breakout introduces a judicial member of this race, Judge Racklas. It is said by Mother Brain that every member of the species looks alike, which was how in the comic Ridley and Racklas were easily switched in their plot to imprison Princess Lana and Samus Aran.

Both Racklas and Ridley take the latter's physical appearance from concept artwork for the original Metroid, which was the only Metroid game in existence at the time. As Racklas has not appeared in any further media, canon or otherwise, it is unknown if Ridley is still canonically part of a race. He is referred to as "geoform 187" in Metroid Prime.