[s3e21] Crystal Skull 【iPhone】

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

In the end, Nicholas Ballard chooses to stay behind with the aliens—the Omeyocan —to learn their knowledge and friendship, finally validating his life's work. Legacy and Trivia [S3E21] Crystal Skull

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. While the rest of the team thinks Daniel

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"

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.