[s3e21]: Crystal Skull

The Omeyocan are "the enemy of my enemy" (the Goa'uld), but surprisingly, they are never seen or mentioned again in the series, leaving a major plot thread dangling for years.

Watching the episode, The Crystal Skull, right now. One of my Faves. [S3E21] Crystal Skull

The emotional core of the episode is Daniel’s relationship with his grandfather, . Nick is an eccentric archeologist living in a psychiatric institution because he claimed to have seen "Giant Aliens" through a similar skull in Belize decades earlier. The Omeyocan are "the enemy of my enemy"

While the rest of the team thinks Daniel has been vaporized or teleported, he has actually been shifted —he is invisible and intangible to everyone except Teal'c, whose Jaffa symbiote allows him to sense Daniel's presence. The Grandfather Connection The emotional core of the episode is Daniel’s

The episode kicks off when SG-1 discovers a massive Mayan-style pyramid on P7X-377. Inside, Daniel Jackson is drawn to a crystal skull that, upon eye contact, emits a blast of "lepton radiation."