E: edora, emmagan, enkarans, event horizon...

[Vern]

Edora
Edora is the scenic planet from season three's "A Hundred Days". The inhabitants are pre-industrial and farm or fish to provide for themselves. And there's also small Naquadah deposits on the planets surface.
Every year Edora passes through an asteroid belt, and meteors burn up in the atmosphere. The inhabitants call this "fire rain". But roughly once every 150 years the meteors impact the surface, and cause clouds of naquadah in the air, making the planet uninhabitable for several days. The inhabitants seek shelter in caves until it is safe to return home.
In "A Hundred Days" Colonel (now General) Jack O'Neill got trapped on the planet when the stargate was buried during the "fire rain".


Emmagan, Teyla


Enkarans
These former slaves were relocated, with SG-1 help, from a Goa'uld colony to a new homeworld. Upon settling, however, they found their new planet being terraformed to permit habitation by another species, the Gadmeer, whose biology and the Enkarans' require mutually exclusive environments. First contact was in season four's "Scorched Earth".


Event Horizon

[River]

Egeria
Queen of the Tok'ra. Seen in "Cure". She was captive for 2000 years after started the Tok'ra movement.

[CaptainHaz]

Earth

Kind of self explanatory. Homeworld of the Tau'ri. Base of human operations.

[Vern]

Emancipation (episode)
On the planet Simarka, the SG-1 team meets the Shavadai; a race of people similar to the ancient Mongols of Earth. These skilled horsemen and fierce warriors operate by a strict code, which includes second-class status for women. Dr. Samantha Carter, who takes a back seat to no man, is threatened by death on her first encounter with the Shavadai chief, Mughal, and is only spared because she saved the life of his son, Abu. Carter faces peril again when she is kidnapped by Abu, who hopes to trade her for the hand of Nya, the daughter of Mughal's powerful enemy, Turghan. The deal goes bad and Carter ends up the unwilling property of the warrior chief. She is determined to escape but torn by pity for the lovelorn Nya and Abu. Carter arranges Nya's escape from Turghan's tyranny and is rescued from his clutches by O'Neill and the SG-1 team. But, Carter's ordeal is not over yet; Turghan caught his daughter trying to elope and will stone her to death for her disloyalty unless Carter can defeat him in combat. In the circle of battle, Carter must prove she is the equal of any man -- or die trying.

Enigma (episode)
O'Neill and the SG-1 team arrive on the planet Tollan to find a scene of chaos and death. A volcano is erupting, spewing choking ash and burning lava, and bodies litter the ground around the Stargate. The team gathers up a few survivors and returns through the gate to Earth. The Tollans, however, are not grateful for being rescued. Their leader, Omoc, dismisses human society as primitive, refuses to answer any questions about his planet's highly advanced technology, and demands to be relocated to a similarly advanced world. Narim, another Tollan, reveals the reason for Omoc's suspicion. Years earlier, Omoc's father shared the Tollan technology with a civilization like Earth's, setting off a war that destroyed the more primitive planet and destabilized Tollan. With military intelligence sniffing around and threatening to put the Tollans to work on weapons systems, Earth seems to be heading down the same path. Having saved the Tollans from death, the SG-1 team must risk court-martial to save them from slavery and to save Earth from self-destruction.

[Vern]

Entity (episode)
The SGC is infected by an alien probe that downloads itself into the base computers, accessing sensitive data on the SGC and its personnel.

Exodus (episode)
SG-1 pays a visit to the Tok'ra homeworld.

Enemies (episode)
Stranded in a galaxy 125 years from home, SG-1 and Jacob Carter battle Apophis, only to be saved by an unlikely ally.

Enemy Mine (episode)
Chaka returns to assist Daniel Jackson in a negotiation with Unas found on a mining planet.

Evolution (episode)
Daniel Jackson and Dr. Lee are taken hostage in South America and tortured for information on an ancient goa'uld artifact. O'Neill teams up with Burke (an operative from his past) to rescue them. Meanwhile, Carter and Teal'c investigate rumors of a new Jaffa super race.

Endgame (episode)
When the Stargate disappears in a flash of light, Carter and Jackson's investigation leads them to a warehouse storing VX rockets with nerve gas. Could the gas be linked to the mass deaths of Jaffa? SG-1 must find out.