[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.

Fans often point out the production still on AppleTV that accidentally shows the skull without its visual effects. [S3E21] Crystal Skull

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." 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 Inside, Daniel Jackson is drawn to a crystal

One of the most beloved comedic moments occurs when Teal'c, following Dr. Fraiser's orders, physically hauls a stubborn, recovering Jack O'Neill back onto his bed.

Bringing Nick to the SGC is the only way to save Daniel. Nick is the only one who can communicate with the "Giants" and convince them to return Daniel to our dimension.