| Asuras | | Planet where Dr. Beckett was able to help engineer a drug that makes the Wraith feeding process ineffective. |
| Bates | | Leader of the secondary Atlantis team. |
| Apollo | | Leader of Atlantis expedition until captured by the Replicators. (full name) |
| Darts | | Man who uses an herb to get people to like him and do what he wants. |
| Alterans | | Leader of the Athosians and joins Sheppard's team. (full name) |
| Genii | | Military leader of Atlantis Expedition that died in The Rising Part 2. (rank and full name) |
| Proculus | | Doctor who replaces Beckett.(full name) |
| Sateda | | Ronon's coach who gets him ready for his IOA meeting. |
| Daedalus | | Name of Wraith who helps Atlantis destroy the replicator homeworld. |
| JenniferKeller | | Replicator homeworld. |
| RichardWoolsey | | Psychiatrist on Atlantis (full name) |
| CarsonBeckett | | Chief Scientist and a member of sheppard's team and has an extremely large ego. (full name) |
| TeylaEmmagan | | Planet were the Atlantis Expedition found Atlantis. |
| Kolya | | Wraith one manned fighters. |
| Oberoth | | Lantean ship discovered floating in space badly damaged. |
| Lantea | | Second most advanced human society in Pegasus. |
| Orion | | Name Sheppard gave to the Lantean ship discovered on the planet with the supervolcano. |
| PuddleJumpers | | Planet protected by Chaya, the ascended being who takes a liking to Sheppard. |
| ElizabethWeir | | What the ancients called themselves |
| ProjectArcturus | | Head of security of Atlantis during season 1. |
| Teal'c | | Member of IOA who visits Atlantis (full name) |
| KateHeightmeyer | | Leader of the Replicators. |
| JohnSheppard | | Member of sheppard's team who was formerly a runner of the Wraith. (full name) |
| Tria | | Name Sheppard gave to Lanteans Gateships. |
| Hoff | | Lantean name of ship discovered on the planet with the supervolcano. |
| Aurora | | Name of experimental power source that McKay accidentally used to blow up a solar system. |
| RodneyMcKay | | Planet where Ronon is from. |
| Lucius | | Leader of the main team of Atlantis (full name) |
| MajorLorne | | Leader of Genii strike force that was able to capture Atlantis during the storm. |
| RononDex | | Head of medical personnel until he died removing an explosive tumor. (full name) |
| ColonelMarshalSumner | | X-304 under command of Abraham Ellis |
| AidenFord | | Lantean ship capable of .999 the speed of light and discovered in the void between galaxies. |
| ZeroPointModules | | Name of the first X-304 to come to Atlantis's aid. |
| Hippaforalkus | | Atlantis's main source of power. |
| Todd | | Member of Sheppards team until he was influenced by a wraith feeding enzyme. (full name) |
