*The Oannes, sub-mariner beings inhabiting the planet Oannes (Stargate coordinates P3X-866), first appear in the episode "Fire and Water." The area immediately surrounding the Gate is volcanic in nature and borders a large body of water. The Oannes possess the technology to alter or implant memories and use ancient Akkadian cuneiform writing to communicate with the SG-1 team.
*Source: back of card