Stargate: 10 Best Aliens In One Episode Only
3. Omeyocans
Appearing in the episode Crystal Skull, these aliens may seem omnipotent (and certainly have a greater grasp of reality and matter transference than humanity do), yet they have a great fear of the Goa'uld - enough to hide from any potential visitors to their world.
They are a highly intelligent race, who open their encounter with a friendly gesture - from their point of view. They phase Daniel Jackson into their plane, though he doesn't understand what has happened and returns to the SGC through the Gate.
Daniel's grandfather Nick Ballard had encountered these aliens before, though no one believed him. The SGC find him, then he discovers he can see Daniel. He acts as a go-between and eventually an ambassador, as he travels to, and remains on, the aliens' world, while Daniel is returned to normal.